On Friday, Apple (AAPL) is launching a second-generation iPhone, called the iPhone 3G, which addresses both of those problems, while retaining the look and feel of the first model’s hardware and software.

The base version of the new iPhone costs $199 — half the $399 price of its predecessor; the higher-capacity version is now $299, down from $499. Yet, this new iPhone is much, much faster at fetching data over cellphone networks because it uses a speedy cellular technology called 3G. And it now sports a GPS chip for better location sensing.

The company also is rolling out the second generation of its iPhone operating system, with some nice new features, including wireless synchronization with corporate email, calendars and address books. And there’s a new online store for third-party iPhone programs that Apple hopes will make the device usable for a wider variety of tasks, including gaming and productivity applications. This new software and store will also be available on older iPhones, through a free upgrade.

I’ve been testing the iPhone 3G for a couple of weeks, and have found that it mostly keeps its promises. In particular, I found that doing email and surfing the Internet typically was between three and five times as fast using AT&T’s 3G network as it was with the older AT&T network to which the first iPhone was limited.

Apple’s new iPhone operating system includes an ‘App store,’ where you can browse for, and download, third-party software.

The iPhone 3G is hardly the first phone to run on 3G networks, and it still costs more than some of its competitors. But overall, I found it to be a more capable version of an already excellent device. And now that it’s open to third-party programs, the iPhone has a chance to become a true computing platform with wide versatility.

There are two big hidden costs to the new iPhone’s faster speed and lower price tag. First, in my tests, the iPhone 3G’s battery was drained much more quickly in a typical day of use than the battery on the original iPhone, due to the higher power demands of 3G networks. This is an especially significant problem because, unlike most other smart phones, the iPhone has a sealed battery that can’t be replaced with a spare.

Second, Apple’s exclusive carrier in the U.S., AT&T Inc. (T), has effectively negated the iPhone’s up-front price cut by jacking up its monthly fee for unlimited data use by $10. Over the course of the two-year contract you must sign to get the lower hardware prices, that adds $240, overwhelming the $200 savings on the phone itself. If you want text messaging, the cost rises further. With the first iPhone, 200 text messages a month came free. Now, 200 messages will cost $5 a month, or another $120 over the two-year contract.

The iPhone 3G still has a couple of features that made the first version unpalatable to some potential buyers. It uses a virtual on-screen keyboard instead of a physical one. While I find the virtual keyboard easy and accurate, not everyone does. Also, in the U.S. and in many other countries, the iPhone is still tied to a single exclusive carrier, whose coverage or rate plans may be unacceptable to some.

Here is a rundown of the changes in the new model.

Design: The new iPhone looks almost exactly like the old one. It is the same length and width, has the same big, vivid screen, and has the same number and layout of buttons. The main difference is the back, which is now plastic instead of mostly metal and curved instead of flat. It’s very slightly thicker in the middle, with tapered edges, and weighs a tiny bit less.

The new iPhone 3G (left) delivers much higher Internet download speeds over cellular networks than the original iPhone (right).

Like its predecessor, the iPhone 3G comes in two models distinguished only by storage capacity: 8 gigabytes and 16 gigabytes. The top model is available in black or white.

Apple has greatly improved the audio on the new iPhone. I found the speaker was much louder, for music and for the speakerphone. But the new phone produced an echo when used with the built-in Bluetooth system in my car. Also, the headphone jack is now flush with the case instead of recessed as on the first model, so it can accept any standard stereo earphones.

The camera, however, is still bare-bones. It can’t record video and has a resolution of just two megapixels. The power adapter is now tiny, at least in the U.S., but Apple no longer includes a dock for charging, just a cable.

Software: The basic software is similar. The biggest addition for some users will be full compatibility with Microsoft’s (MSFT) widely used Exchange ActiveSync service, which many corporations use. In my tests, I was able to connect the iPhone 3G to my company’s Exchange servers in a few minutes, and my corporate email, calendar and contacts were replicated on the phone. Any changes I made on the iPhone were reflected almost instantly in Microsoft Outlook on my company PC, and vice versa. Email was pushed to the phone as soon as it was received on the company’s servers.

One drawback: While you can have both personal and Exchange email accounts on the new iPhone, if you synchronize with Exchange calendars and contacts, your personal calendar and contacts are erased.

The new iPhone and upgraded older iPhones also will be able to use a new Apple consumer service, MobileMe, which offers synchronized push email, calendars, photos and contacts.

There are other improvements. You can now delete multiple emails at once, set parental controls and search your contacts. You can also save photos in emails or from Web sites. You can also now open Microsoft PowerPoint files sent as attachments, though I found in my tests that opening larger PowerPoint files crashed the phone.

Some software features missing from the first iPhone are still AWOL on the new one. There’s no copy and paste function, no universal search, no instant messaging and no MMS for sending photos quickly between phones.

Network: Like the old iPhone, the new one can perform Internet tasks using either Wi-Fi wireless networking or the cellphone networks. But the addition of 3G cellular capability makes the new model more useful for Web surfing, email and other data tasks when you’re not in Wi-Fi range. In my tests, in Washington and New York, I got data speeds mostly ranging between 200 and 500 kilobits per second. By comparison, the original iPhone, tested in the same spots at the same time, mostly got cellular data speeds between 70 and 150 kbps on AT&T’s old EDGE network. The new iPhone typically was between three and five times as fast as the old one.

While AT&T now has 3G networks in 280 U.S. cities, and aims to be in 350 by year end, it is converting its cellphone towers gradually, so not all areas of included cities have 3G coverage. The new iPhone falls back to EDGE speeds when 3G isn’t present.

One side benefit to 3G is that in some areas, voice coverage improves. At my neighborhood shopping center, where the first iPhone got little or no AT&T service, the iPhone 3G registered strong coverage. But I still found that calls regularly broke up on some major streets. In New York City, riding in a taxi along the Hudson, one important call was dropped three times on the new iPhone. Finally, I borrowed a cheap Verizon (VZ) phone and got perfect reception.

Battery life: Apple claims that over 3G, the new iPhone can get five hours of talk time, or five hours of Internet use. Talk time is twice as long on the older EDGE network, and Internet time is an hour better with Wi-Fi.

I ran my own battery tests using the phone’s 3G capability. Although I left the Wi-Fi function on, I didn’t connect it to a network, so the phone had to rely on 3G. In my test of voice calling, I got 4 hours and 27 minutes, short of Apple’s maximum claim and nearly three hours less than what I recorded in the same test last year on the original iPhone. In my test of Internet use over 3G, I got 5 hours and 49 minutes, better than Apple’s claim, but far short of the nine hours I got using Wi-Fi in last year’s tests.

More important, in daily use, I found the battery indicator on the new 3G model slipping below 20% by early afternoon or midafternoon on some days, and it entirely ran out of juice on one day. I overcame this problem by learning to use Wi-Fi instead of 3G whenever possible, turning down the screen brightness and even turning off 3G altogether, which the phone permits.

The iPhone 3G’s battery life is comparable to, or better than, that of some other 3G competitors. But they have replaceable batteries. The iPhone doesn’t.

Third-party software: If things go as Apple hopes, third-party software could be the biggest attraction to the new iPhone 3G, and to upgraded older iPhones. By some estimates, there will be hundreds of these programs, some free and some paid, almost immediately.

Apple didn’t supply me with programs for testing, but I managed to try several on older devices upgraded to the new operating system. I tested a game that used the phone’s motion sensors to control the action, and I tested several programs from America Online (TWX), including AOL Instant Messenger; AOL Radio, which streams music from the Internet; and AOL’s Truveo video search engine. All worked very well.

Among the programs Apple has publicly previewed were a sales automation program from Salesforce.com, a game called Super Monkey Ball from Sega and a program for bidding on eBay (EBAY). Also made public were a news reader from the Associated Press, a program for following live games from Major League Baseball and several programs for doctors, including the Epocrates drug reference.

Bottom line: If you’ve been waiting to buy an iPhone until it dropped in price, or ran on faster cell networks, you might want to take the plunge, if you can live with the higher service costs and the weaker battery life. The same goes for those with existing iPhones who love the device but crave faster cellular data speeds. But if you already own an iPhone, and can usually use Wi-Fi for data, you probably should hold off and get the free software upgrade before deciding whether it’s worth getting the new hardware.

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.

I attended the iPhone launch event, and was able to use one for a little while. That’s too brief an encounter to allow me to write a proper review. But I can say that it has the largest and most beautiful screen I’ve ever seen on a cellphone, even though it’s incredibly thin. It felt great in my hand. It has a brilliant new user interface; the handsomest email program and Web browser I’ve ever seen on a phone; a full-blown iPod music and video player built in; and even a cool new voicemail system.

The iPhone has some potential downsides — it doesn’t use a physical keyboard, instead relying on a virtual keyboard on the screen, which may put off heavy email users. It runs on the relatively slow EDGE cellular data network, though that flaw is partly offset by the fact that it can also use speedy Wi-Fi wireless networking. And, with a $499 base price, it’s expensive.

Still, the iPhone made my relatively new Treo 700p seem primitive in many respects when I compared them side by side. And the Apple product isn’t Palm’s only problem.

Palm’s position as the design leader in smart phones has been under assault for months. Major phone makers like Motorola and Nokia have introduced models that have most of the Treo’s capabilities but are thinner, sleeker and lighter — and much less expensive.

The Treo maker is starting to respond, but haltingly. It has brought out a couple of slightly smaller new models, but they’re no match in sleekness or style for competitors like the Motorola Q. They also aren’t as cheap. They do, though, have some advantages in software and functionality that, for some users, will make them preferable.

I’ve been testing the latest skinny contender, the Samsung BlackJack, along with Palm’s newest Treo, the slimmed-down Treo 750. Both of these phones — like the Apple phone — run on the Cingular Wireless network. Both also use Microsoft’s Windows Mobile software.

The new Treo 750 is slimmed down a bit from the familiar Treo 700 and 650 models. The 750 is also a little shorter, because it does away with the protruding antenna. In addition, it’s a hair thinner and about 16% lighter.

But next to the new Samsung BlackJack, the Treo 750 looks bulky. The BlackJack is a striking, all-black model in the slim tradition of the Motorola Q. It manages to cram a full keyboard, like the Treo’s, into a body that is much sleeker and better looking. The BlackJack is 35% lighter — and 36% smaller overall — than the Treo 750. It has a physically smaller screen, but that screen has a third better resolution than the Treo’s. (Of course, both screens look tiny and grainy compared with the display on the new Apple phone.)

Also, the BlackJack claims 38% better battery life than the Treo, and it runs on a faster data network than the Treo. (Neither phone includes Wi-Fi.) And, to top it all off, the BlackJack is half the price — $199, compared with $399 for the Treo 750.

One of the Treo’s biggest advantages has been its Palm software, which I consider to be better designed for email and phone calls than the Windows Mobile software from Microsoft. But the new 750 model can’t claim that advantage because, while it has Palm hardware, it uses the Microsoft software.

The Treo does have a small software advantage over the BlackJack. It uses a fuller version of Windows Mobile that has more features than the stripped-down version used on the BlackJack and the Motorola Q. And, because it has a touch screen, the Treo is easier to navigate than the BlackJack, which must be controlled with buttons and a scroll wheel on the side.

Also, the Treo’s control pad felt better to me than the BlackJack’s, which was cramped. I kept hitting other buttons on the BlackJack while trying to scroll or select icons.

In my tests, both the Palm and the Samsung sent and received voice calls well. Both also exhibited the clumsiness that is inherent in Windows Mobile — multiple key presses were needed to do simple tasks. Both have basic cameras with resolutions of 1.3 megapixels. (The Apple iPhone’s camera will be two megapixels.)

The BlackJack runs on Cingular’s new broadband data network, called “3G” or HSDPA, while the Treo 750 uses a slower network called UMTS. Oddly, however, in my tests, the Treo was generally as fast or even faster at retrieving Web pages than the BlackJack.

Of these two phones, I prefer the BlackJack. But if you’re in the market for a smart phone and can afford $499, you might want to wait until June for the Apple iPhone. The Apple entry is so full of promise that anyone buying a smart phone in 2007 should at least wait for the full reviews and a chance to try it out.

Email me at mossberg@wsj.com.

The slender Motorola Q, despite software that is markedly inferior to that of the Treo 700p, is wooing some users because it is much slimmer and now can be had for just $99, versus $299 for the Treo. The Nokia E62 is about the size of the Q and also costs just $99 these days. The tiny BlackBerry Pearl is just $199. And Samsung has introduced the skinny BlackJack for $199, too.

So, this month, Palm is striking back with a lighter, thinner, cheaper model of its own, the Treo 680, which is being offered by Cingular Wireless at $199.

Meanwhile, T-Mobile has introduced a new slim, light competitor called the Dash. It has built-in Wi-Fi wireless networking to supplement the slower cellphone data network. And it costs just $149.

I’ve been testing the new Treo and the Dash. Both are OK, but neither is as good as it could be. The new Treo still has great software, but it makes some compromises and still fails to match the new competitors in slimness, lightness or price. The Dash has very nice hardware, but is hampered by lousy software.

The Treo 680 is shorter than the Treo 700, because it doesn’t have the 700’s protruding antenna. It’s about 11% thinner and 14% lighter. But it’s still much larger than the new class of Q-type competitors. The Dash is slightly wider than the new Treo and about the same length. But it’s much thinner and lighter. The Dash feels great in your hand because it has rubberized paint.

This new Treo works just like the 700p. It uses the same Palm operating-system software, which is much easier and faster than the Windows Mobile software used by the Dash and the Q. As I have noted in the past, simple operations like deleting an email or displaying your calendar are usually one-click processes on the Palm OS devices, while they often take two or more clicks, or involve opening menus, on the Windows devices.

Also, the Treo 680, like the costlier 700p, comes with better functionality for handling Microsoft Office documents than the Dash does, even though the latter uses Microsoft software. The 680 has the same large, high-resolution screen as the 700p. By contrast, the screen on the Dash, while bright and vivid, is lower resolution.

But the new 680 is less capable than the 700 series Treos. First, it runs on a much slower cellphone network, called EDGE. This EDGE technology isn’t broadband speed, and is only about one-seventh as fast as the networks from Verizon Wireless and Sprint that the Treo 700 uses. Cingular does have a new network with speeds comparable to Verizon’s and Sprint’s, but the Treo 680 can’t take advantage of it.

Second, the Treo 680 is a big step backward in terms of its camera. The camera’s resolution is only about a third of a megapixel, while the camera on the Treo 700 — and the Dash — is 1.3 megapixels. Finally, the stylus on the Treo 680 is cheap and just plain awful. It actually bends when you use it.

The Dash is also stuck on the slow EDGE network technology because that’s the best data network T-Mobile currently offers. It makes up for it with built-in Wi-Fi, which is much faster than EDGE, and potentially much faster than the Verizon and Sprint cellphone data networks.

In my tests, I was able to use the Dash for email and Web browsing via Wi-Fi in my office, my home and a couple of coffee shops. The Wi-Fi setup and connection process was fairly easy, and T-Mobile has added software to the Dash that guides you through setting up access at Wi-Fi hot spots it operates in airports, Starbucks shops and other locations.

In fact, T-Mobile offers a data plan for $30 a month that includes both cellphone Internet service and access to its Wi-Fi hot spots. This is on top of the cost of a voice plan.

There are some downsides. The Dash doesn’t automatically switch on Wi-Fi. You have to do it manually. And, in my tests, it was much slower using Wi-Fi than a laptop was. For instance, in my home, on my very fast Wi-Fi connection, the Dash got just under one megabit per second, while a Mac laptop inches away got over 14 mbps. On a slower network in my office, the Dash got around half a megabit per second, while a computer inches away got 1.3 mbps.

I also found the keyboard on the Dash to be more cramped and harder to use than the one on the Treo. And the touch strip it uses to control volume didn’t work well.

If you have always wanted a Treo, but couldn’t handle the price tag, the 680 may be for you. Just be prepared for its slower speed and inferior camera. If you yearn for Wi-Fi in a slender smart phone, and can put up with a clumsy software interface, go with the Dash.

• Email me at mossberg@wsj.com.

But that image will change radically next week when the BlackBerry’s maker, Research in Motion, introduces a sleek but powerful model called simply the Pearl. It’s not only the smallest BlackBerry ever made. It’s also the smallest smart phone from any maker with a keyboard for typing emails and other text.

All shiny black and silver, the slender Pearl looks more like a fashion phone than a keyboard-equipped smart phone. It is shorter, narrower and lighter than the much-admired Motorola Q, though a bit thicker. And, like the Q, the Pearl, which is being launched next Tuesday by T-Mobile, costs $199 with a two-year contract. The Pearl is squarely aimed at consumers who need powerful email capabilities, but also want style and bells and whistles.

When it comes to email, the Pearl is a true BlackBerry. The email interface is essentially the same as on larger BlackBerrys. It can be used with a traditional corporate BlackBerry email system, and, for consumers, it works with the BlackBerry Internet Service offered by T-Mobile.

Still, for hard-core BlackBerry addicts, the Pearl is a shocking departure. The iconic side scroll wheel has been replaced by a tiny, light-up trackball beneath the large, bright color screen. It’s the first BlackBerry with a camera, the first with a memory card slot (though no card is included) and the first to play songs and videos.

And then there’s the keyboard, where the slim new design has required a major compromise. As on the older and bulkier BlackBerry 7100 series, the full keyboard has been replaced by a smaller version that squeezes two letters onto most keys. To avoid repetition and error, the Pearl uses smart software called SureType that has the uncanny ability to guess the word you meant to type in almost all cases. But it doesn’t work if you’re entering a new Web address or a person’s name that the phone hasn’t memorized.

To find out if RIM can actually be cool, I’ve been toting around a Pearl, testing all its functions. In general, I like it, and can recommend it to anyone who wants real BlackBerry email capabilities in a great-looking multimedia phone. Voice quality was excellent and the interface for making phone calls, once a big problem on BlackBerrys, is now decent. There’s even a Treo-like universal silencer button, and the speaker phone function turns on and off with a single key press.

Setting up an email account with the BlackBerry Internet Service is easily done, either on the phone or via a T-Mobile Web page. This service replaces a corporate email server with a Web-based email system that pushes messages to the phone from an existing email account or from a new one. T-Mobile plans to charge $19.99 a month for unlimited email and Web browsing on top of the price of an existing voice plan.

The Pearl pushed my normal email to the phone perfectly, and, in that respect, it acted just like every other BlackBerry I’ve used. Because of the different keyboard, some of the keyboard shortcuts for navigating in email and other applications differ from those on older models. If you change a couple of settings, you can delete an email with one click, and whole batches of emails can be deleted with two clicks.

Popular email attachment types, including Microsoft Word and Excel files, can be opened and read, but not edited. I was able to easily synchronize calendar and contact entries with Microsoft Outlook on a Windows PC, and to easily transfer songs, pictures and videos to the Pearl using RIM’s desktop software.

The Pearl’s music software correctly read the artist, album and song information on every track I loaded into the phone, and even displayed the album covers. The speaker on the Pearl sounds good, and music sounds even better with stereo headphones.

Photos also displayed well, and the Pearl can zoom in on them or show them as slideshows. Any song can be turned into your ring tone, and any picture can be used as your desktop wallpaper.

The Pearl really shone when playing video. Unfortunately, it accepts only a limited number of video file types, and even many of those I tested didn’t work. Some videos sucked up so much of the phone’s power that other functions, even pausing the playback, were very slow.

The Web browser is OK, but it’s hampered by what I consider the biggest drawback to the Pearl: the network on which it runs. T-Mobile uses a network technology called EDGE, which is much, much slower than the fastest networks offered by Verizon, Sprint and Cingular.

There’s another reason I’m not trading my Palm Treo 700p for a Pearl: the user interface. While RIM has jazzed up the hardware and feature set, there’s still way too much multiple clicking and menu opening for my taste.

But the Pearl is a beautiful piece of work, a very nice combination of hard-core email capability and fun features.

Email me at mossberg@wsj.com.

The Finnish cellphone giant is introducing a phone called the E62 that resembles, and is aimed at, the Palm Treo, the latest BlackBerry phones from Research In Motion and the Motorola Q.

Nokia’s E62

Like those other smart phones, the E62 has a full keyboard and is actually a little computer that is meant to be a serious email device as well as a phone. Like the Q and the Treo, it can play music and videos, surf the Web, and display photos.

Unlike the Treo and the Q, however, the Nokia E62 can run a service licensed by RIM that allows it to behave like a BlackBerry. It can send and receive email using either a corporate BlackBerry server or a consumer BlackBerry service offered by a cellphone carrier.

I’ve been testing the E62 and I like it. It’s fairly utilitarian-looking and won’t likely become an object of desire like the Q and the Treo. But it gets the job done and may well be the best bargain in its category.

In the past, Nokia has relied on a smart-phone design that was a thick, long device that flipped open to reveal a wide, horizontally aligned keyboard and screen. That design sold OK in Europe but flopped in the U.S. Now, with the E62, Nokia is adopting the American-type design pioneered by the BlackBerry and used by the Treo and the Q.

Nokia is being coy about the timing, pricing and wireless carrier for the E62. But I expect it to be available late next month from Cingular Wireless. And I expect it to cost even less than the Q, which at $199 is the least expensive product in this group. The latest Treo models, the 700p and 700w, are being sold by Verizon Wireless for $299 right now, after rebates.

The E62 works on the so-called GSM cellphone standard that’s universal in Europe, and used by Cingular and T-Mobile in the U.S. This means it can be used in both America and Europe, as well as in some other countries. The Treo 700 models, sold by Verizon and Sprint, and the Q, sold only by Verizon, use an American technology called CDMA that doesn’t work in Europe or in most places outside the U.S.

However, that GSM technology also saddles the E62 with its biggest drawback: It is much slower at receiving data such as email and Web pages than the Q or the Treo 700, or even certain BlackBerry models. That’s because it uses EDGE, a GSM variant that has been blown away by a technology called EVDO used by the Treo 700 and the Q. In my tests, EVDO has been up to seven times as fast as EDGE.

The E62 also lacks a camera, unlike the Q and the Treo 700. But, like them, it has Bluetooth wireless technology.

Nokia has built in a sharp, vivid screen with a resolution of 320 by 240. That’s better than the resolution on the Treo 700w and identical to the Q’s screen resolution — but inferior to the resolution on the Treo 700p.

The new Nokia is a bit larger than the Q — wider, thicker, longer and heavier. But it’s thinner and lighter than the Treo 700, albeit a bit wider and longer.

In my tests, the voice quality of the E62 was very good. Battery life was decent, with a talk time of between four and 5.5 hours. The phone accepts memory cards for storage of files and applications.

The BlackBerry Connect service and software, likely to cost around $45 a month, worked well. After I installed the BlackBerry software on the new Nokia and configured the service on the E62 and on an accompanying Web site, the service “pushed” all emails from my regular account to the E62 reliably. There’s no limit to how much email you can receive, though the carrier may intervene if it believes you are abusing the service.

The only downside of the BlackBerry Connect feature is that there’s a noticeable latency when you open an email before it displays on the screen.

In my tests, the N62 could open most major email attachment types, including Word documents, Excel spreadsheets and Adobe PDF files. It’s also supposed to work with PowerPoint presentations, but in my tests, this function failed.

The user interface on the E62 isn’t nearly as fast or slick as on the Palm operating system used by the Treo 700p. But I preferred it slightly over the Windows Mobile operating system used on the Treo 700w and some other smart phones. There were still too many menus and extra steps compared with the Palm system, but at least you can delete an email with one click. Turning on the speaker phone was also quick and easy.

I was able to synchronize the E62 with Microsoft Outlook, and bring over my contacts and calendar, using the separate Windows software that comes with the phone. And I was able to load up the memory card with pictures and songs from my computer and use them successfully on the E62.

All in all, the E62 is a solid and inexpensive smart phone.

• Email me at mossberg@wsj.com.

I’ve been testing two new small and light laptops from these companies: the Sony Vaio SZ160, and the Lenovo ThinkPad X60s. Both weigh in at under four pounds, so they won’t break your back when you tote them on the road. But each has plenty of power, decent battery life and a rich set of features. And, despite their small size, these machines are capable of serious work, partly because both use Intel’s new Dual Core processor, which packs the equivalent of two processors into one.

I like both machines, but they have different benefits and downsides. The ThinkPad is the latest entry in a long line of small, rugged laptops with great keyboards and strong battery life. It has a speedy, optional, internal cellphone modem for connecting to the Internet over a cellphone network. But it lacks an internal optical (CD or DVD) drive.

At the cost of just a little more weight and size, the Sony I tested includes an optical drive and a bigger screen, but it lacks a cellphone modem and has weaker battery life than the Lenovo configuration I tested. For enhanced security, both laptops have built-in fingerprint readers that can bolster or replace typed passwords. Neither is a bargain-basement laptop. The Sony SZ series starts at $2,000, and the ThinkPad X60 series starts at $1,900. They come in many different configurations, and thus many different prices. The ThinkPad X60s I tested, which included a cellphone modem, an extra-strength battery and a dock with an optical drive, costs $2,300. The Sony SZ I tested, which didn’t include a dock, an extended battery or a cellphone modem — but did have that internal optical drive — costs $2,500.

The Lenovo ThinkPad X60s

The Thinkpad X60S I tested weighed 3.46 pounds, while my Sony SZ160 test model weighed just 3.72 pounds, even with the bigger screen and optical drive. The ThinkPad is 10.5 inches wide by 8.3 inches deep, and it’s between 0.8 inch and 1.11 inches thick. The Sony is 12.5 inches wide by 9.3 inches deep, and it’s between 0.9 inch and 1.3 inches thick. The Sony’s larger dimensions are mainly a result of its bigger screen — 13.3 inches, versus 12.1 inches for the Lenovo. The Sony screen is also higher resolution.

I put both laptops through my usual tough battery test, wherein I turn off all power-saving software, crank up the screen brightness to the max, turn on the wireless networking, and then play an endless loop of music.

My test ThinkPad, with its double-capacity battery, lasted a very impressive four hours and 49 minutes. In normal use, with power-saving turned on and a more typical work pattern, I’d expect it to last six hours or more, which is excellent. My test Sony, which had a normal-size battery, lasted just three hours and two minutes, even though the machine was running on its so-called Stamina setting. In normal use, the Sony would likely top four hours. Presumably, a Lenovo with a standard battery would do worse, and a Sony with an extended battery would do better.

Neither can match Apple when it comes to the quality of its built-in software. Lenovo’s is too geeky and is aimed more at corporate than consumer customers. Sony’s is more consumer-oriented, but it’s inconsistent and confusing.

The ThinkPad X60s, like its predecessors from IBM, is compact and rugged, with strong hinges and the best keyboard in any laptop. It has both built-in Wi-Fi wireless networking and a built-in cellphone modem that works on Verizon’s speedy EV-DO network.

My test machine worked well on all the typical computing tasks most people do, but there was one small defect in a Lenovo-supplied wireless software program that kept turning off the Wi-Fi. The company says this problem appeared only in early models like mine and has been fixed. Overall, the quality seemed as good as when IBM was making the machines.

The Sony Vaio SZ160

But the Thinkpad X series really should have an internal optical drive by now. When it was introduced, few ultra-small laptops had them, but since then Sony and others have figured out how to install optical drives in even smaller boxes.

The Sony SZ series is interesting because, while it’s not Sony’s smallest or lightest line, it packs a larger screen and an optical drive into a package that’s under four pounds. Like the Lenovo, it worked well at all typical tasks.

The SZ’s biggest innovation is that it has two graphics systems and the aforementioned “Stamina” mode, controlled by a switch, which allows you to use the weaker graphics hardware to save battery power. Its biggest downside is that its optional cellphone modem (available this summer in a pricier premium model I didn’t test) works on Cingular’s EDGE network, which is only about a seventh as fast as the Verizon network Lenovo uses.

You won’t go wrong with either of these well-designed laptops. For road warriors, they are worth their hefty price tags.

• Email me at mossberg@wsj.com.