As always, this is a general guide aimed at mainstream, nontechnical consumers who dwell on common tasks such as email, instant messaging and surfing the Web; managing and lightly editing photos, videos and music; and using basic office applications. It is not intended for heavy gamers, video producers or corporate buyers.

There’s a vast variety of laptop models, but this guide is meant to cover the most common types of laptops, those with screens from about 12 inches to 17 inches, and weights ranging from around 2.5 pounds to 7 pounds.

For this column, I’m not including the category of tiny machines now called netbooks, with screens under 10 inches. I am also ignoring the huge, heavy laptops with screens larger than 17 inches that are primarily aimed at gamers.

Even the remaining mainstream machines range wildly in price, from bargain-basement models at $350 to high-end ones that can top $3,000. In my experience, the top brands for technology and reliability are Apple and Lenovo’s ThinkPad line, but various models from Sony, Hewlett-Packard, Toshiba and Dell are also worth investigating.

So, here is a quick guide to the key factors you should consider when buying a laptop.

Size: If you are a constant traveler, think about the subnotebook models, which generally weigh 3 pounds or less. There are two types of these. The classic subnotebook has a small screen, 12 inches or less, and a cramped keyboard. This year, a new type emerged, with a full keyboard and a normal 13.3-inch screen packed into a thin, light body. There are two of these: the MacBook Air from Apple and the Lenovo ThinkPad X300. All subnotebooks are relatively costly, typically ranging from $1,500 to over $3,000.

If your laptop will mostly stay at home, the office, or in class, a 5-7 pound machine with a screen of either 13.3 inches or 15.4 inches is the best bet. A well-equipped model in this class is likely to run you between $800 and $1,200. Typical models in this class are the Dell Inspiron 1525, the HP dv6700 and the Apple MacBook.

Windows vs. Mac: This is the eternal question. In my view, Apple’s Leopard operating system is faster, better and far less prone to malicious software than Microsoft’s Vista operating system. And the Mac laptops also come with better built-in software. The $1,099 MacBook is a solid, fairly priced machine, and the $1,999 MacBook Pro is even better. Both also can run Windows.

But Windows laptops are often less expensive, tend to have a greater variety of ports and slots, and come in more styles and sizes.

Apple’s MacBook

Operating system: If you are buying a Windows laptop, be aware that Vista is slower than Windows XP, in my experience, and still has compatibility issues with add-on hardware and software. If you’d prefer to stick with XP, you will find that many fewer models are available with it. And Microsoft has decreed that after June 30, mainstream, name-brand laptops will no longer come pre-equipped with XP.

Video: I recommend getting an LED-powered screen, which is brighter and saves power. Also, if you are choosing Vista, or if you do a lot of converting video for use on portable devices, consider getting a laptop with a separate video card inside that has its own memory.

Memory: If you’re buying an Apple laptop, two gigabytes of memory is plenty. If you’re using Vista Home Premium, I’d consider three gigabytes for best performance.

Processor: Any dual-core processor will be fine. Don’t pay a penny extra for faster processor speed.

Storage: In a mainstream laptop that will be your main computer, look for a 160-gigabyte hard disk or larger. A new kind of storage, called SSD, or solid state disk, is now available. But it is still way too costly for most users, and at the moment is available only in smaller capacities.

Battery life: Many laptops today rarely spend time away from an electrical outlet. But if yours will, look for a battery life of at least three hours between charges.

Wireless: Make sure your new laptop has the new, faster “N” version of Wi-Fi built in. Many cheaper laptops don’t. You can also get a cellphone modem built in, but they are costly and carry a monthly fee. You can always add an external cellphone modem later.

Other features: A built-in camera and microphone can be quite useful, and so can a feature on some Windows machines that allows you to play music and videos without fully booting up the computer.

Don’t let yourself be swayed by sales pitches, or by fanaticism for or against Windows or the Mac. Think hard about how you use your computer and what your budget will allow, and stick to those priorities.

• Email me at mossberg@wsj.com. Find all my columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.

There are tools for dealing with the problem, most commonly, filtering software that attempts to bar sexual, violent and other objectionable material. But these can frustrate kids and parents, by either blocking too many things or not blocking enough.

Avatars help guide users

Some other approaches, such as the parental controls built right into the latest Windows (MSFT) and Macintosh (AAPL) operating systems, offer parents more control by allowing them to specify what Web sites a child can access. But that requires close and constant involvement by the parent as the child seeks access to more Web sites.

This week marks the launch of a parental-control service with a somewhat different approach. It’s called KidZui, and it aims to offer kids a safe subset of the Internet where they can roam freely without triggering parental worry. KidZui, for children ages 3 to 12, hopes to emphasize the positive, rather than the negative.

The service, from a San Diego company of the same name, claims to encompass 500,000 safe sites, photos and videos, ranging from pop culture to science, comics and games to history. You can watch the latest “American Idol” contestant, learn about dinosaurs, delve into history or visit popular kids’ sites, such as Webkinz and Club Penguin.

The sites, photos and videos included in KidZui are approved by a team of about 200 parents and teachers across the country, and are ranked by age, so that a site that might be right for an 11-year-old isn’t served up to a 4-year-old.

While a child can establish a list of friends in KidZui, and can share content with them, there is no instant-messaging or email function.

KidZui isn’t free, and it can’t be accessed via a regular Web browser. Instead, you must download a special KidZui browser, from kidzui.com, that runs on either Windows or Macintosh computers. I tested it on both platforms, and it downloaded quickly and installed smoothly.

The service nominally costs $99.95 a year, or $9.95 a month, but there is a 30-day free trial and an introductory rate of $49.95 a year, or $4.95 a month. It has no ads, other than those already present on Web sites kids visit.

A key selling point of the service is that busy parents can simply set up KidZui and trust that their kids will be safe online. To that end, the program can be optionally configured, so that a child can’t escape from it to use the computer’s standard browser, for example. A parent can set KidZui to launch when the computer starts up, in full-screen mode. In this mode, KidZui automatically disables or hides the common keystrokes, icons, commands and techniques that allow users to switch to, or to start up, other programs.

In addition, when KidZui is running in this locked-down mode, the child can be barred from quitting KidZui without a parent’s password. In my tests over the past week, I found some loopholes in this lockdown system, but the company plugged each leak I turned up. I can’t swear that a clever kid won’t be able to escape from KidZui, but the program blocks most obvious exits.

Inside the software, the company has tried to create a fun, lighthearted world. Each child is represented by a “Zui,” a cartoon-like character that can be customized with hair, clothing and other features. There are lots of sound effects, and kids can rate content with illustrated tags ranging from “best” and “cool” to “boring” or “gross.”

When a child types in a term like “ocean” KidZui offers a list of related terms as well, to guide further exploration. If a child types in a search term or a Web address that has been banned from the KidZui universe, a message appears saying “This page isn’t available on KidZui, but your parents can add it for you.” This applies not only to terms typed into KidZui’s own search bar, but also to terms a child enters at sites like Wikipedia or in the search boxes embedded in other sites. The main pages of Google and Yahoo can’t be summoned.

If a search or Web address is new to KidZui, a different message appears promising that it will be reviewed.

I did find some holes in this system. For instance, I was able to get to The Wall Street Journal’s Web site and do an internal search on “Spitzer,” which turned up a story on the former New York governor’s sex scandal.

Parents can get detailed reports about the KidZui activities of each of their children and can tweak the content they can see by adding specific types of material, such as “athletic violence,” and approving or blocking specific Web sites.

For parents who want to allow limited Web use by their young children without constantly micromanaging their online activities, KidZui may be worth a try, but don’t expect it to be perfect.

Email me at mossberg@wsj.com. Find all my columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com.

There are several reasons for this, including the security problems in the dominant Windows platform from Microsoft; spillover from Apple’s blistering success with its iPod music players; the fact that Macs can now run Windows programs; and Apple’s highly successful chain of company-owned retail stores.

But another key factor has been the Mac operating system, called OS X, which came out in 2001. It has proved to be as powerful and versatile for mainstream consumers as Windows, yet easier to use and more secure. And Apple has upgraded OS X far more rapidly than Microsoft Inc. has upgraded Windows, bringing out major new releases roughly every 18 months, while Microsoft struggled for more than five years to produce the latest Windows iteration, Vista, which came out in January.

On Friday evening, Apple will release yet another new version of OS X, called Leopard, to replace the current version, known as Tiger. I’ve been testing Leopard, and while it is an evolutionary, not a revolutionary, release, I believe it builds on Apple’s quality advantage over Windows. In my view, Leopard is better and faster than Vista, with a set of new features that make Macs even easier to use.

Leopard will come preinstalled on all new Macs. It can also be purchased for $129 as an upgrade to existing Macs that, depending on configuration, can be as many as six years old. Unlike Vista, which is sold in four noncorporate upgrade versions ranging from a $100 stripped-down “basic” edition to a $259 deluxe “ultimate” edition, there’s only one version of Leopard. It includes all the features, from those aimed at novices to those aimed at power users.

For me, the marquee features in Leopard are a new function called Time Machine that automatically backs up your entire computer in the background; two new methods, called Cover Flow and Quick Look, for rapidly viewing the contents of files without opening any programs; and new techniques that allow you to access the files in, and to remotely control, other computers on your network or connected over the Internet with a few clicks and no technical expertise.

Plus, Apple’s free software for running Windows on a Mac, called Boot Camp, which was formerly an add-on users had to download and install, is now built right into the operating system. And, in my tests, the third-party Fusion program for running Windows and Mac programs simultaneously continued to work fine in Leopard.

I did notice a few drawbacks, but they were minor. The menu bar is now translucent, which can make it hard to see the items it contains if your desktop picture has dark areas at the top. The new folder icons are dull and flat and less attractive than Vista’s or their predecessors on the Mac. While Time Machine can perform backups over a network, the backup destination can only be a hard disk connected to a Mac running Leopard. And, on the Web, I ran into one site where the fonts on part of the page were illegible, a problem Apple says is known and rare and that I expect it will fix.

While Apple claims the new system includes more than 300 new features, there is nothing on the list that could be considered startling or a major breakthrough. Some of Leopard’s features are unique, but many others — such as backing up data and quickly viewing files — have been available on both Windows and the Mac via third-party programs or hard-to-find geeky methods buried in the operating systems. Leopard has made them easy to find and use.

When I upgraded my personal iMac desktop to Leopard, it took less than an hour, and after the process was complete, all my programs, including the Mac version of Microsoft Office, the Firefox Web browser and Adobe Reader, worked rapidly and fine. I was still able to run Windows XP via Fusion. And my previous installation of Boot Camp, which turns the iMac into a speedy, full-fledged Vista machine after a reboot, worked perfectly. All my Vista programs and files continued to function properly.

With Cover Flow, users get a visual preview of a computer’s files without having to open programs.

In fact, every piece of software and hardware I tried on two Leopard-equipped Macs — a loaned laptop from Apple and my own upgraded iMac — worked fine, exhibiting none of the compatibility problems that continue to plague Vista. My old Hewlett-Packard inkjet printer, for which Vista lacks the proper software, worked instantly in Leopard, even over the network. And, unlike with Vista, it was able to print on both sides of the page. I popped my old Verizon cellphone modem card into the test Leopard laptop and it worked, too, with no software installation or tweaking.

Leopard felt about as fast as Tiger, and it started up much faster than Vista in my tests. I compared a MacBook Pro laptop with Leopard preinstalled to a Sony Vaio laptop with Vista preinstalled. Even though I had cleared out all of the useless trial software Sony had placed on the Vaio, it still started up painfully slowly compared with the Leopard laptop.

It took the Vista machine nearly two minutes to perform a cold start and be ready to run, including connecting to my wireless network. The Leopard laptop was up, running and connected to the network in 38 seconds. In a test of restarting the two laptops after they had been running an email program, a Web browser and a word processor, the Sony with Vista took three minutes and 29 seconds, while the Apple running Leopard took one minute and five seconds.

Here’s a rundown of some of Leopard’s key features. Much more detailed information is available at apple.com/macosx.

File management: Apple’s Finder, the equivalent of Explorer in Windows, now offers two new ways to quickly see what your files contain. You can still view them as icons or lists. But you can also use Cover Flow, the same system Apple uses in iTunes and on the iPhone to display album covers for music. In Leopard, a large preview of each file you select appears above the list of files in a folder, and you can rapidly scroll through these icons. These previews are live, and their contents can be viewed without opening the program that is normally needed to display them.

Time Machine backs up files.

For instance, if the file is a video, you can just click on it, and it will play. If it’s a multipage PDF file, you can click on it, and arrows will appear allowing you to flip through the pages.

An even better and deeper look can be obtained using a feature called Quick Look. Just hit the space bar or click on a toolbar icon, and a preview of any selected file zooms out. You can even view multiple sheets in an Excel file via Quick Look without launching Excel.

Another quick new way to see your files is available in the Dock, the Mac’s equivalent of the Windows Task Bar. Here, any folder you place on the right side of the dock will display its contents, after a single click, either as a grid of icons displaying miniversions of the file or as a “fan,” or arc, of such icons. These special Dock folders are called “Stacks.” Leopard includes one by default that is the destination for everything you download from the Internet, so your desktop will no longer get cluttered with downloads,

Time Machine: This built-in feature will continuously back up all of the contents of your Mac to either an external hard drive directly connected to the computer, or to a hard disk connected to another Mac running Leopard that’s on your network. The initial backup, in my tests, took all night, but after that, the system updates the backups hourly and I didn’t notice any slowdown during the process.

To recover any file you deleted, you simply click on the Time Machine icon, and you are taken to a view that shows file folders — or your email or address book or photo collection — in a stack of windows that appear to go on infinitely. You click on an arrow and the stack of windows zooms until you arrive at the last view in which the missing file existed. Then, you click “restore,” and the file is recovered in your normal desktop view. You can also restore whole folders, groups of files, or even an entire hard disk.

Shared computers: In Leopard, any computer that has been set to be shared on your network shows up on the left side of every Finder window. Click on it, and you can access whatever folders have been shared on those machines. Depending on the remote computer’s security settings, you may first have to enter a user name and password. It’s the simplest method I’ve ever seen for accessing other computers on a network. And it works with Windows PCs as well as Macs. When I first turned on the Leopard laptop in my office, it immediately found a shared folder on my colleague’s old Dell running Windows XP. She hadn’t even remembered sharing the folder, which contained files from 2003.

You can copy or move files to and from these shared computers, or view their contents with Cover Flow and Quick Look, or open them in programs on your own computer.

If you are a member of Apple’s optional .Mac service, which costs $100 a year, you can use a feature called “Back to My Mac,” which can access your Macs from thousands of miles away over the Internet. However, this feature works only over certain kinds of routers (not all of them Apple’s) and, as my router didn’t qualify, I couldn’t test it.

Remote control: For any Mac in your shared-computers list for which you have permission, you can take over the screen by simply clicking on a button called “Share Screen.” You can also remotely control distant Macs over the Internet using Apple’s built-in iChat instant messaging program, as long as you have permission and the Macs are running Leopard.

Stacks displays the files in folders in the dock.

iChat: Apple now allows you to use its instant messaging program with Google Talk as well as AOL’s AIM service, and you can set up a video chat in which you can present a slide show or display a document. You can also add special backgrounds that can make it look as though you’re someplace else, like Paris. In my tests, this even worked with someone on the other end using a Windows XP computer running the latest version of AIM.

Spaces: In order to cut down desktop clutter, Leopard lets you set up as many as 16 different desktops that can run simultaneously, with different programs open in each. You switch among these desktops by using keyboard commands or a menu.

For instance, you might have your iPhoto and iTunes running in one “space,” or desktop, your Web browser and email program in another, and Windows XP in another.

Leopard isn’t a must-have for current Mac owners, but it adds a lot of value. For new Mac buyers, it makes switching even more attractive.

Email me at mossberg@wsj.com. Find all my columns and videos online free at the new All Things Digital web site, http://walt.allthingsd.com.

Just use an Internet-based service so that you can chat from a Web page without having to install any software, which might be blocked by a firewall. I tested two such services: Meebo at www.meebo.com and KoolIM at www.koolim.com. Both are free.

These services let you simultaneously log in to multiple IM accounts — and communicate with people with various services. If you have a friend who uses Yahoo Messenger, for example, and another who likes MSN Messenger, you can chat with either.

Another plus: Meebo and KoolIM are far less vulnerable to viruses than downloadable applications. They’re also more efficient, saving users the hassle of installing multiple programs on a computer. This is especially handy for people with old computers that slow down when running several applications.

Meebo has a well-designed, sleek interface that makes it appealing to even the least tech savvy. From its home page, you simply sign in for different IM services—MSN Messenger, Yahoo Messenger, GTalk (or Jabber) and AIM (or ICQ). Your buddy list will be combined automatically. You don’t have to register, but if you do, you get perks such as a single sign-on for all of your accounts, and the ability to share files, save chat logs and store conversations.

I tried Meebo on my work Windows PC and my iBook at home, and it worked well on both. To start chatting, you just log in to any of the IM services by entering the screen name and password you already have with a service, or by picking a new name, password and services. Your buddy list will appear in a window on the right side of the page, with each name marked by an icon denoting the service the person uses. Once in your buddy list, you can add or delete a contact, message or join a group chat.

The service also offers MeeboMe, a way to chat from your own Web site. Bloggers can use this to start a conversation with site visitors who log in to their Meebo account. It also shows how many users are on the site at any time.

But Meebo, like most such Web services, lacks the ability for audio and video chats — basic features on installed IM software. If you’re used to plugging in a Webcam and headgear to chat with friends, these services might not be for you. Meebo also doesn’t have the standard send button that’s on installed IM software. Instead, you press a key on your keyboard.

Sharing files using Meebo is tricky, too. Only Meebo account holders can send files; although anyone can receive them. When I sent a PDF file to my friend on her installed MSN Messenger, she received a message and a link that rerouted her to Meebo’s home page with no further guidance. When I sent her the same file after she logged in to her MSN using Meebo, she could open the file.

KoolIM also connects users to multiple IM accounts from one Web page. It gives you the option to create an online account, so you don’t need separate log-ins for each IM service you’ll encounter.

You can select an embedded or a pop-up version of the service. The embedded version shows your buddy list and messages as windows tied to a Web page, while the pop-up version lets you move the windows around the screen. You can choose to display all of your buddies or only the ones online. In your buddy-list window you can add and delete names and log in to or out of a service.

I didn’t like having text ads appear at the bottom of the IM window in KoolIM, or the fact that, unlike Meebo, there isn’t a time stamp on messages to tell you when they arrived. It also doesn’t allow you to send files, as Meebo does. And it doesn’t let you save conversations or chat logs. KoolIM’s lack of some of these basic features might make it less appealing to consumers, especially those who ponder swapping it with their desktop software.

I preferred Meebo, but both services are good alternatives to installed IM, if you’re willing to do without audio and video features.

Walt Mossberg is on vacation. Find all my columns and videos online free at the new All Things Digital Web site, http://walt.allthingsd.com.

• Email me at Sarmad.Ali@wsj.com.

The result is a polished, fairly powerful email program that I prefer to Google’s much-hyped Gmail, which is undergoing an even longer gestation. It has been in beta status since April 2004.

I’ve been testing the new Yahoo Mail on both Windows and Macintosh computers. It has some downsides, but it beats Gmail, in my view, both in terms of features and in terms of its ability to act like a standard computer program rather than a Web page, something for which Gmail often gets more credit.

A closer competitor to Yahoo Mail is actually Microsoft’s Hotmail, now called Windows Live Hotmail. But Yahoo tops Hotmail, too, in my opinion.

The new Yahoo Mail, which works in Internet Explorer and Firefox on Windows, and in Firefox on the Macintosh, is now more than just an email program. Like Gmail, but unlike Hotmail, it has a built-in instant-messaging module. You can choose to communicate with any of your contacts via a real-time chat, right from within Yahoo Mail, as long as that contact is online and has an IM account on either the Yahoo or Microsoft instant-messaging networks. You don’t need to be running your IM program.

Unlike either of its competitors, however, the new Yahoo Mail also allows you to exchange text messages with people on cellphones, although the message exchange must be initiated from Yahoo Mail.

Yahoo Mail offers unlimited storage of emails and attachments free of charge, and a very fast and good search capability — like Gmail’s — so you can keep years of messages on hand and retrieve them quickly. Gmail offers 2.9 gigabytes of storage free. It sells extra storage for prices ranging from $20 a year for six gigabytes to $500 a year for 250 gigabytes. Hotmail is in the process of boosting its storage to five gigabytes, free, and 10 gigabytes for $20 a year.

With Yahoo Mail, you can send attachments of up to 10 megabytes per message and 20 megabytes if you opt for a $20-a-year plan that also eliminates the annoying banner ads that litter the free version. Gmail offers attachments of up to 20 megabytes free. Hotmail allows 10 megabyte attachments and 20 megabytes under its $20-a-year plan, which also banishes ads. Gmail has no banner ads, just text ads that run alongside the emails and can’t be eliminated.

This new Yahoo Mail is gradually being rolled out in coming weeks. The company still plans to retain the older version of Yahoo Mail, now called Classic, for people who prefer it, or for those using browsers that are incompatible with the new version, such as Apple’s Safari.

The new Yahoo Mail allows you to do things that once were impossible in a Web-based email program. For instance, you can drag messages to new folders, or select a group of messages in the same way you would with a standard email program, to delete them or mark them as read or unread. Unlike in Gmail, when you right-click on a message you get a list of options that pertain to the mail program — like “Reply to Sender” — instead of options that pertain to the use of the browser — like “Add to Favorites.”

Also, Yahoo Mail features a very nice tabbed interface that Gmail and Hotmail lack. With this interface, which is separate from the browser’s own tabs, you could have your inbox in one tab, an instant-message or text-message conversation going on in another and a new email you are composing occupying yet another. You can move among these tabs without losing the content in any of them.

And like Hotmail but not Gmail, Yahoo Mail offers a preview pane, like Microsoft’s Outlook, so you can see the contents of an email without opening it. Gmail offers just a “snippet” of the message content. Unlike Gmail, which forces you to view your emails as bunched-up “conversations,” Yahoo Mail — like Hotmail — displays them as a standard email program does, sorting them by date, sender, subject or size.

So what are the downsides of Yahoo Mail?

Well, the biggest is probably that unless you pay for the $20-a-year premium plan, you can’t view your Yahoo mail account in a standard email program such as Outlook or Apple Mail. Gmail allows this free of charge. Hotmail allows it free in Outlook and in Windows Mail, though it will soon announce the capability for other email programs for premium members and, eventually, for free members as well.

Also, I found Yahoo Mail could sometimes be slow. When I created a new folder and tried to drag 200 emails into it, I was warned that I couldn’t do that because the new folder was “still being created.”

But overall, Yahoo did a really good job making its online mail program versatile, powerful and accessible.

Email me at mossberg@wsj.com. Find all my columns and videos online free at the new All Things Digital Web site, http://walt.allthingsd.com.

Some devices, like Treos and full-size BlackBerrys, opt for the larger size and the keyboard, while others assume you’ll peck out email or Web addresses on a phone keypad.

I’ve been testing a new $295 smart phone from Helio, an upstart company based in Los Angeles, that provides an elegant solution to this design problem. It’s called the Helio Ocean and it can look like either a standard voice phone or a keyboard-equipped email and Web device, depending on which way you open its unusual two-way sliding mechanism.

The Ocean also has some very nice software touches to complement this clever hardware design.

It isn’t as slender as some of its competitors and it has a few downsides, but the Ocean is an innovative, thoughtfully designed smart phone that advances the state of the art. It goes on sale over the next week or so at helio.com and in some retail stores later this month.

Helio not only designed the Ocean, but the phone works on Helio’s own cellphone service, which runs on Sprint’s network at broadband speeds. It lacks Wi-Fi wireless networking.

Plans with unlimited data access range from $65 to $135 a month, depending on the number of voice minutes. For $145 a month, you can get unlimited data and minutes.

When closed, the Ocean is just a roomy screen with some buttons at the top and bottom of a black rectangular body with rounded corners. If you hold it vertically with the screen in portrait mode and slide the screen up, a standard phone keypad is revealed that you can hold to your ear when making calls, just as on a standard voice phone.

If you turn the Ocean horizontally so its screen is in landscape mode and slide it up, a full typing keyboard is revealed that puts you in a comfortable position to compose messages and surf the Web. All the main functions are available in both modes and you can use a headset in either mode.

The software is smart, too. When you physically switch the Ocean from one orientation to the other, the screen display switches between portrait and landscape modes automatically. If you answer the phone while in horizontal landscape mode and you aren’t using a headset, the call automatically is placed in speakerphone mode, because it would be clumsy to hold the Ocean to your ear in that configuration. If you slide the keyboard closed and switch to vertical mode, the call continues and the speakerphone is automatically turned off.

When closed, the Ocean looks a bit stubby but it’s actually slightly smaller in every dimension than a Treo 700 — although it gets larger when the keyboard is exposed.

Voice calls were clear and crisp, and the speakerphone function worked well. It was easy to add numbers to the address book.

From the main screen, you can just start typing anything and the Ocean will either search your address book for the characters you type or initiate a Web search. Web-search results are presented in multiple search engines, including Google and Yahoo, Amazon and Wikipedia, which are arrayed in tabs.

I found the keyboard easy to use and was able to attain good accuracy on it while typing with my thumbs. However, the space between the top row of keys and the bottom edge of the screen is a bit cramped; it took some adjustment to thumb-type well on that row of keys.

The Ocean comes preconfigured for all the major consumer email services, including Yahoo, AOL, Hotmail and Gmail. You can manually add others. The Ocean also supports Microsoft Exchange email.

Unlike a Treo or a Windows Mobile phone, the Ocean doesn’t allow editing of Microsoft Office documents. You can only view them as text files and, in my tests, even that didn’t work. Helio plans new software that would allow the documents to display properly.

Similarly, the Ocean works out of the box with a variety of instant messaging services, including AIM, Yahoo and Windows Live Messenger. It also has multiple media functions. It sports a two-megapixel camera with flash and decent built-in software for displaying photos, and playing music and videos. It also accepts memory cards for expanded storage.

You can simply plug the Ocean into a Windows or Macintosh computer and drag photos, songs and videos onto its internal memory or memory card, if they are in a supported format. But in my tests of this, some photos wouldn’t display properly and none of the album art showed up in my MP3 songs. Helio says the album art will show up if you use synchronization software on Windows, instead of simply dragging the files over.

Despite some limitations, the Helio Ocean is an impressive device that’s fun to use.

• Email me at mossberg@wsj.com. Find all my columns and videos online free at the new All Things Digital Web site, http://walt.allthingsd.com.

Lots of you found yourself logging in, probably multiple times, using passwords you could barely remember because you are forced to change them so often. Then, you entered a world of computing where much of the power and variety of the technology was closed off to you in the name of security or conformity by an information-technology department in your large corporation or organization. Various Web sites were off-limits, as were tools like instant messaging, even though they might have legitimate business purposes.

Others of you, lucky enough to work in a home-based business or in any business or organization too small to have an IT department, could get right to work, using the full range of changing resources and tools offered by software and Internet companies.

So, which of these worlds is the computer industry’s favorite? If you guessed that the industry cares most about customers who use all it has to offer and are most willing to try new things, you guessed wrong. The computer industry cares little about consumers and very small businesses. It is focused on serving the IT departments of large corporations and organizations.

This is true even though, by some estimates, twice as many computers are in the hands of individuals and very small organizations than are in the control of corporate IT departments.

Sure, big computer makers such as Dell and Hewlett-Packard make and sell “consumer” models with lots of whiz-bang features. But they really focus on corporate customers and jump to the tune of IT managers. Dell recently folded its separate consumer division in the U.S., conceding that only a relatively small slice of its U.S. business is from consumers.

In fact, the industry operates on a false model of the U.S. computer-using population. It imagines the world is divided between “consumers,” who lie around at home playing games and listening to music, with the occasional homework assignment or tax form thrown in; and “enterprises,” large corporations where computing is controlled by IT departments and only mission-critical tasks are performed.

If these models acknowledge small businesses at all, they get lumped into a category called SMB, for small and medium businesses, where the minimum size is something like 500 employees and an IT staff rules.

In fact, the most accurate way to divide the computer-using world is into two segments: the one controlled by an IT department and the one controlled by the people who actually use the computers, be they consumers or small-business folks. A vast amount of business crucial to the U.S. economy is conducted every day in the non-IT part of the computing world.

The computer industry loves, and caters to, the IT segment because it buys machines in large quantities and is run by a geeky priesthood that speaks the industry language. By contrast, the non-IT camp, even though it is larger in the aggregate, buys one, two or three machines at a time and tends to be nontechnical.

A few years back, Dell moved a part of its telephone support overseas. Consumer and corporate customers complained. Dell quietly switched some activity back to the U.S., but only for corporate customers, at least at first.

This focus on the corporate world can have real, and sometimes negative, consequences for consumers and small businesses. For example, some of the big security problems in Microsoft’s software in recent years came because the company included features used only by corporate IT staffs in the products it sold to everyone. One was a communications feature, meant for network administrators, which sleazy operators misused to bombard people with ads. Why was that on my PC in the first place?

Other technology sectors do the same thing. Cellphone carriers, for instance, seem to think noncorporate customers don’t need many phones with decent email software.

Only one major computer company focuses mainly on the non-IT part of the computing world: Apple Computer. This is partly because Apple failed to make inroads in corporations, but it’s also because it prefers to aim its products at actual users, not intermediary buyers.

Some of you wonder why reviewers like me, writing for the non-IT part of the world, have consistently praised Apple products in recent years. One reason is that they are good. Another is that they have been unaffected (so far) by the plague of viruses and spyware that makes Windows users miserable. But an underlying reason is the focus on individual users.

There are some small, Windows-based PC companies that sell mainly to the non-IT world. The best example is Alienware; another is eMachines, now part of Gateway. But they tend to cater to narrower markets than Apple. Alienware is aimed mainly at gamers, eMachines at bargain hunters.

In my view, the world would be better off if the biggest computer companies started catering more to the non-IT part of the market, where most computers live.

• Email me at mossberg@wsj.com.