Now, two more set-top boxes have been launched to try to marry the Internet and the TV. Both adapters, from Sony (SNE) and Roku, worked well in my tests, but each has limitations. The problem is that one of the boxes supplies content from a wide range of Internet video sources, but only works on selected models of one brand of TV set; the other works on a wide variety of TVs, but only provides a single source of content.

Sony’s adapter is the Bravia Internet Video Link. This is a $300 module that attaches to certain Sony HDTV models. It can either be set up beside the TV or snapped onto the back of the set. Once it’s connected to your TV and to your home network for Internet access, a new menu appears on the TV allowing you a choice of videos from numerous online sources, including YouTube, Yahoo (YHOO), Blip. TV, Sports Illustrated, AOL, Wired, and the Web sites of CBS (CBS), Showtime and more.

Setting up the Bravia Internet Video Link was straightforward, even though it involved a welter of cables. There is no built-in Wi-Fi — you need either a cable or an add-on wireless adapter to connect to the Internet. The primary hookup to the TV is via a modern type of cable called HDMI, for High Definition Multimedia Interface.

I tested the Sony Link using the company’s most unusual HDTV set — a tiny, very costly model that uses a very thin, very vivid new screen technology called OLED, for Organic Light-Emitting Diode. This TV provided a spectacular picture, but it isn’t required to use the Sony module. The Link works on many larger, more common Sony sets with more common screens. It just doesn’t work on non-Sony TV sets.

Sony’s Bravia Internet Video Link adapter

The Sony module doesn’t have its own remote control. It uses the one that came with the TV. This makes for an awkward experience, because there are no standard play and pause buttons, and various other buttons on the remote meant to do one thing on the TV may do another when watching Internet video via the Link module.

Also, I found some of the Internet content to be disappointing. Many of the items labeled “movies” on various Internet channels were really just trailers, and some content was stale. For instance, some baseball news videos on Yahoo were weeks old.

However, Sony plans to make one of its feature films, “Hancock,” available through the Link module before it’s released on DVD. More important, it will be adding access to Amazon’s (AMZN) forthcoming video-streaming service, which promises to contain a wealth of full-length content.

The Netflix Player by Roku is much simpler. In fact, it was the simplest set-top box I have ever tested. It costs just $100 and does just one thing: It allows Netflix (NFLX) subscribers to view its movies and TV shows via the Internet on a television set instead of on a computer. It can’t get you any other video content from the Internet.

The Netflix player is a small, plain black box that works with most TVs, not just digital or high-definition models. It connects using both old-fashioned cables, like the kind used by many VCRs and older DVD players, or an HDMI cable.

Unlike the Sony, the Roku box includes both wireless and wired Internet connectivity, and has its own remote. While the box is capable of displaying high-definition content, the Netflix service isn’t currently streaming movies and TV shows in high definition, so you get varying quality, depending on your TV and Internet speed, up to DVD-type levels.

There’s no added monthly fee required to use the Roku box, but you must be a Netflix subscriber. The box merely displays the movies or TV shows you have placed in your Instant Queue on Netflix. You have to do this on your computer before viewing the videos on the Roku box. You can choose from around 12,000 streaming movies and TV shows, far fewer than the 100,000 titles Netflix makes available via DVD, but a sizable collection.

In my tests, the Roku box set up quickly and easily, the interface and remote were simple and effective, and the movies and TV shows I tested streamed quickly and without hesitation over my fast home Internet connection.

Both products are meant to promote sales of other things — Sony TVs and the Netflix movie-rental service. They do these tasks well, but neither is the breakthrough solution that will connect most TVs to most Internet video content.

Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

Starting Thursday, however, there will be a new online service that aims to change all that. The service, called SnagFilms, allows anyone with a blog, a Web site, or even a page on a social-networking site, to open a virtual movie theater and show these documentaries, free. The virtual theater is a small widget that contains the film, and that can be embedded easily and quickly in a wide variety of popular social-networking services and blog platforms. No technical knowledge is needed.

Once a site or page owner “snags” a film in this way, visitors to the site can view it in a larger window that pops out from the widget. This window plays the film, displays some ads and provides links to charities or organizations related to the topic of the movie. The films can even be played in full-screen mode. Many also include links for buying a DVD of the film. All that’s missing is the popcorn.

These aren’t homemade, three-minute YouTube (GOOG) clips. Nearly all are feature-length, professionally produced documentaries, from both small independent filmmakers and well-known sources such as PBS and National Geographic.

The owner of the site or blog gets no direct revenue from posting the films. He or she is, in effect, donating space to support the film or the cause it highlights, a decision SnagFilms calls “filmanthropy.” But the filmmaker and SnagFilms do make money — splitting advertising revenue equally. And the charity or organization can make money, too, if viewers opt to donate. The filmmaker also can make money from DVD sales, paying SnagFilms an 8.5% commission.

I have been testing a prerelease version of the SnagFilms service and have posted SnagFilms widgets with no problems to Facebook, MySpace (News Corp), iGoogle, Netvibes, Blogger, Windows Live Spaces (MSFT) and Vox. Many more Web sites can house these widgets, including the vast number of blogs built on the popular WordPress and TypePad platforms.

Here’s how it works. You just go to the SnagFilms Web site at www.snagfilms.com, select one or more of the 250 or so films available at launch and click the snag button. A menu pops up that lists numerous popular networking services and platforms. Clicking one will automatically post the SnagFilms widget of your choice on your page or site at one of these services. You can also simply view the films at the SnagFilms site.

Each widget includes an “info” button that takes you to a page on the SnagFilms site giving the details and background on the film. You can also leave comments here, rate the film, order the DVD and see recommendations for related films.

The system is viral, so you don’t have to start at the SnagFilms site. A Web surfer who sees a SnagFilms movie anywhere on the Web can spread it around just by clicking the snag button on every widget. The snag button allows the viewer to either host the film or to email a link to the film that will bring friends to the SnagFilms site to view or snag it.

SnagFilms is the brainchild of Ted Leonsis, a former top executive at America Online (TWS), who in recent years has become a documentary-film producer. He became frustrated with the distribution bottleneck for such films and arranged to take over AOL’s documentary site, TrueStories, and turn it into SnagFilms. He also is chairman of the board of a company, Clearspring, which created the film widgets.

At launch, the SnagFilms catalog includes well-known documentaries like “Super Size Me,” but also lesser-known films on a wide variety of topics, including college football, AIDS in Africa, politics, profiles of average people and tales of the New York Fire Department. One of my favorites was “Paper Clips,” the story of how a school in Tennessee learned about the Holocaust.

Filmmakers can submit movies to the site by sending an email to: submissions@snagfilms.com. SnagFilms says it doesn’t censor or edit the films, but won’t accept pornography or films deemed to encourage hate. It does have a selection process, so not all films submitted will make it onto the site. The company hopes to add more films soon.

I had only two gripes about SnagFilms. First, the films should be able to play inside the widget itself, with an option inside to play at larger sizes. Having to open a separate browser window is a pain. The company says it’s working on this.

Second, the initial catalog is light on documentaries from a conservative or probusiness perspective. But the company says it is “actively seeking to offer differing viewpoints” and will soon add “a number of films that are quite conservative in philosophy.”

SnagFilms is a great idea for getting documentary films in front of more people. It’s another example of how the Web is changing media distribution for the better.

• Find all of Walt Mossberg’s columns and videos online, free, at the All Things Digital Web site, walt.allthingsd.com. Email him at mossberg@wsj.com.

Beginning this summer, as soon as next month, wireless Internet access will arrive in the passenger cabins of some commercial U.S. airliners.

On these Internet-equipped planes, any passenger with a Wi-Fi enabled laptop — or a cellphone with Wi-Fi — will be able to do almost everything he or she could do online at home or at the office. That includes surfing the Web, using email, having instant-messenger text chats, downloading and uploading files, and streaming video and audio.

In fact, I did all these things a few days ago on a test flight using the new system, called Gogo. During the flight from San Francisco to Denver, on a small test jet, I could operate online as if I were sitting at my desk, or in a Starbucks. I used Dell (DELL) and Apple (AAPL) laptops, a BlackBerry (RIMM), a Windows Mobile phone and an iPhone to perform all the most common online tasks, while soaring over majestic mountains and glorious national parks.

I sent and received emails on Microsoft (MSFT) Outlook and Apple Mail, including messages with hefty attachments. I conducted IM chats on AOL (TWX) Instant Messenger and Google (GOOG) Talk. Using all the major Web browsers, I called up dozens of Web sites, and watched video clips on Hulu and YouTube. I downloaded photos, songs, PDF files and Microsoft Office documents. I used all the Internet functions on the iPhone, and on the Wi-Fi-equipped BlackBerry and Windows Mobile phone.

One important caveat: Gogo is a data-only system. It doesn’t allow phone calls and will block all services that allow voice conversations to be made over the Internet.

Gogo will launch on three American Airlines (AMR) routes, likely in July. The first planes to use it will be American’s 15 Boeing 767s flying between New York and Los Angeles, San Francisco and Miami. Later in the year, Gogo will be available on all of Virgin America’s small number of routes, and possibly additional American routes, if the first deployment works well. It’s supplied to the airlines by a Denver-based company called Aircell, which says it is in negotiations to offer the Gogo service on several other major U.S. airlines by next year.

The Gogo service will cost a flat fee of $12.95 for flights of three hours or longer, and $9.95 for shorter trips. You log into Gogo as you would any commercial Internet service, registering on a special Web page. Aircell plans to allow advance sign-up, so you’d only have to enter an ID and password on the plane. No add-on software, hardware or cables are required.

A few Web functions will be offered free from Gogo, including access to the American Airlines Web site, to Frommer’s online travel guides and to a limited selection of articles from The Wall Street Journal.

Gogo isn’t the first in-plane Internet service. A few years ago, Lufthansa (LHA.MU) offered a satellite-based service from Boeing (BA), mainly on over-ocean flights, but it was canceled.

The service operates at respectable, if not blazing, speeds — similar to what you’d get on a cellular broadband service or a slow home DSL line. On my test flight, download speeds varied from 266 kilobits per second to about 1.4 megabits per second, with the most typical speeds hovering between 500 and 600 kbps. Upload speeds were between 250 and 300 kbps. I found that most of the tasks I tested, except for streaming video, felt smooth and normal.

Speeds could degrade on a large plane with scores of people online simultaneously. But Aircell claims it has the technology to make my experience representative for anyone doing common tasks, such as Web surfing and email. During my test flight, eight laptops and six Wi-Fi-enabled smart phones were using the system simultaneously. All registered decent speeds, except for a couple of minutes when the plane was crossing between the zones controlled by the company’s ground-based towers.

Aircell gets Internet access to the planes through a network of 92 towers scattered across North America. These essentially are cellphone towers, carrying a high-speed cellphone data signal, except that the Aircell antennas point up, into the sky. A receiver on the underside of the aircraft picks up the signal, which is then distributed through the plane via Wi-Fi.

The companies say Gogo is safe and won’t interfere with the plane’s operation. It is government-approved, and pilots can shut the system off should they deem it necessary.

Gogo has some limitations. The service plans to allocate its capacity so that low-bandwidth activities like Web surfing and email take priority over high-bandwidth ones like streaming video. That means you may find video to be slow and halting.

And Gogo is a North American, land-based service only. It won’t work over the oceans and, for now, it won’t work on other continents.

But for U.S. travelers who want to stay connected in the air, Gogo does the job.

• Find all of Walt Mossberg’s columns and videos online, free, at the new All Things Digital Web site, http://walt.allthingsd.com. Email him at mossberg@wsj.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.

These technologies allow users to create highly personalized pages filled with just the information or tools they desire. If you’re interested in the car industry and college basketball, live in Toronto, love to view family photos and often use a calculator, you can fill your computer screen with small modules that display relevant information and necessary tools for all these interests. You won’t have to browse through the Web or launch a bunch of large programs.

These modules and miniapplications appear as small square or rectangular objects, with the content or functionality inside. You can arrange them as you like.

There are two broad categories of these personalized pages — those that appear as Web pages, and thus require you to be online to use them, and those that are on your local desktop. The latter don’t require an Internet connection, though some of their modules may work only if you’re online.

On the Web, the most familiar of these modular systems is My Yahoo, which allows you to combine page segments featuring Yahoo’s own news and information with segments containing syndicated feeds of headlines from other sites, often called RSS feeds. Others have launched similar pages. One longstanding competitor is Microsoft’s my.msn.com.

On the desktop, the best known miniapplication system is Apple’s Dashboard, which allows Macintosh users to install tiny programs called Widgets that perform searches, display photo slide shows, track stocks, play music, and more. Microsoft’s new Windows Vista operating system, out this week, has a comparable system called Sidebar.

Now, there’s a new free Web site that combines some of the best features of My Yahoo and Dashboard. It’s called Netvibes, it’s available at Netvibes.com, and it’s unusual because it’s from Paris, France — not Silicon Valley or Seattle.

Like My Yahoo’s system for displaying feeds from non-Yahoo sources, Netvibes allows you to fill your personal page with headlines from all over the Web. And like Apple’s Widgets, Netvibes’ modules are produced by a wide variety of users, who upload them and make them available free.

I’ve been a My Yahoo user for many years, mostly because it allows me to see a lot of information at a glance, and it’s mainly plain text so it loads fast. I also use Apple’s Widgets on my Macintosh machines. But I find myself using Netvibes more and more lately.

Netvibes isn’t the only new Web player in the personalized Web page space. A new entry called Pageflakes, run by an ex-Yahoo executive, promises a graphically richer approach than Netvibes that the company claims is easier for novices to customize. It’s at pageflakes.com.

And Yahoo is in the process of revamping My Yahoo to update its look and features. The details of the new design aren’t public yet.

Like My Yahoo, Netvibes is text-heavy and loads quickly. But depending on which module you use, it can have color and graphics.

A menu down the left-hand side of the screen lets you quickly add modules to Netvibes. Popular ones are listed in this menu, and you can browse or search for others by clicking a link called “Get more modules.” You can add feeds — headlines from regular Web sites that support them — by clicking “Add a feed.”

Among the modules you can add to your Netvibes page right from this menu, without navigating to any setup page, are weather forecasts, a notepad, a to-do list and calendar, and modules that perform searches for Web pages, blogs, pictures, videos and podcasts.

There are also email modules that will display your new messages from Gmail, Yahoo Mail, Hotmail, AOL Mail or any regular old email account you configure. Others display content from eBay, MySpace, Fox Sports and more.

To add an unlisted feed, you just navigate to a Web page that offers feeds and copy the Web address into Netvibes’ ”Add a feed” feature. Or you can place a button on the toolbar in the Firefox Web browser that will add a new feed with one click.

On my Netvibes page, I have modules that show the weather, my latest emails, the most popular stories from the Journal’s Web site, and top headlines from various technology and sports Web sites. I have colorful modules displaying photos from Flickr and other photo sites, and modules for video searches.

One nice feature of Netvibes is that you can set up automatically updated searches for terms that may appear in blogs all over the Web. For instance, you could create a module that will constantly show any new blog entries featuring, say, “Microsoft Vista” or “Apple iPhone.”

There are some downsides to Netvibes. Some of its modules seem aimed at techies, not mainstream users, and others are in French, though a version customized for American users is in the works.

But Netvibes — and competitors like Pageflakes — will give My Yahoo a run for its money. They provide an easy way to cut through the clutter of information that confronts us all.

• Email me at mossberg@wsj.com.

Lately, however, that has begun to change. A number of major Web-mail providers have introduced versions that offer much more of the ease of use and power of desktop email programs like Microsoft Outlook. Yet they still retain the core advantage of Web-mail services: They can be accessed from any computer, Windows or Mac, with your settings and preferences always present. All you need is an Internet connection and a Web browser.

Google kicked off the trend last year with Gmail, which for the first time offered to store, free, a huge volume of old email messages — 1 gigabyte, which was raised to 2 gigabytes or more. Other Web players boosted their free storage limits.

Now, the Web-mail competition has taken a new turn, going beyond storage. Yahoo, EarthLink and AOL all have recently introduced versions that lift their functionality well beyond the old model of Web mail. All are using new programming techniques that turn them from simple Web pages into something resembling the fluidity of desktop applications.

For instance, these new email offerings allow you to drag and drop items, and do most things without waiting for a Web page to refresh or a new page to open. That’s a big change from the old system, where any significant action was performed in circuitous ways and required the Web page containing the email program to tediously reload.

This is a major breakthrough, and one that will extend beyond Web mail. More Web sites will be revamped to look and work like regular desktop programs, hastening the day when most applications may reside online.

I’ve been comparing the new version of Yahoo Mail, which claims to be the leader in Web mail, with Gmail, the challenger Yahoo most fears. My verdict: The new Yahoo Mail is far superior to Gmail. Yahoo more closely matches the desktop experience most serious email users have come to expect. Gmail, by contrast, is quirky and limited. Its only advantage is its massive free storage, which exceeds what most people will ever need.

Both products are officially in “beta,” or test, status. Neither is easy to obtain and use. If you want a Gmail account, you have to be invited by an existing account holder, or go through an odd sign-up process using your cellphone. Yahoo’s new version, just a week old, is — for now — available only to Yahoo Mail account holders the company selected, though the user pool will be expanded later this fall.

The new Yahoo Mail retains the basic terms of the current version. You get 1 gigabyte of mail storage free of charge, and the program displays ads. For $20 a year, the storage doubles to 2 gigabytes, and the ads disappear.

The new version is radically easier to use. For example, there’s a preview pane, just as in desktop programs, that allows you to view the contents of an email without opening it. You can open multiple emails at once. You can drop messages into folders you create. You can right-click on various items to see short menus of useful tasks, like “add sender to address book.” You can delete multiple messages at once by selecting them and clicking on a trash-can icon.

By contrast, Gmail has none of these new, fluid, desktop-like features. You can’t scroll through all of your messages’ headers without loading a new Web page. And there’s no preview pane, only a feature that shows a snippet of the content of an email.

To delete groups of messages, you have to wait for multiple consecutive pages to load, showing new headers. You can’t drag and drop. And Gmail’s address book, unlike Yahoo’s, doesn’t allow you to collect contacts into group addresses.

But Gmail’s limitations go beyond this. On several key issues, Google’s engineers have decreed that familiar email practices are no longer useful, and have substituted approaches they prefer, arrogantly denying users any choice.

Gmail doesn’t allow folders, only color-coded labels, as an organizing technique. It forces you to view all of your email in groups of related messages called “conversations,” instead of viewing them individually as they arrive. Other email programs also allow such grouped views, but they permit users to choose. Not Gmail, where “option” is a term too rarely employed, except in reference to employee compensation. (Yahoo plans to add an optional grouped view soon.)

Similarly, Gmail forces you to view ads alongside your emails. Unlike Yahoo, it offers no paid option to avoid the ads.

I’m sure Gmail will get better and better, and will eventually adopt the new programming techniques that allow desktop-like ease of use. But I’m not sure Google’s arrogance will ever make room for user preferences on things like folders or ads, or how emails are grouped.

Yahoo’s new email program would blow Gmail away if it were widely released today. That’s partly due to its features, but also to its respect for user choice.

• Email me at mossberg@wsj.com