All PDAs

The Bottom Line: The Sony Mylo Communicator 2 is a huge improvement over its predecessor, but the Wi-Fi handheld will have a hard time competing with the similarly priced and better featured iPhones, Sidekicks, and Helio Oceans of the cellular world.

Specs: 1 GB, IEEE 802.11b, IEEE 802.11g, 5.2 in x 0.8 in x 2.6 in, Stylus, Keyboard

The Bottom Line: The Sony Mylo Communicator 2 is a huge improvement over its predecessor, but the Wi-Fi handheld will have a hard time competing with the similarly priced and better featured iPhones, Sidekicks, and Helio Oceans of the cellular world.

Specs: 1 GB, IEEE 802.11b, IEEE 802.11g, 5.2 in x 0.8 in x 2.6 in, Stylus, Keyboard

The Bottom Line: Though not necessarily worth the price for an upgrade, the Nokia N810 Internet Tablet brings some nice additions to the mobile Web browsing device, including a full QWERTY keyboard and integrated GPS.

Specs: Linux, 128 MB, Texas Instruments 400 MHzOMAP2420, IEEE 802.11b, IEEE 802.11g, Bluetooth 2.0 EDR, 5 in x 0.6 in x 2.8 in, Stylus, Keyboard, Touch-screen

The Bottom Line: On paper, the Mio DigiWalker P550 looks to be an attractive gadget for the mobile professional, combining the capabilities of a PDA and GPS into one device. However, its poor battery life and subpar navigation skills tell a different story.

Specs: Microsoft Windows Mobile 5.0, 64 MB, Samsung 400 MHzS3C2440, IEEE 802.11b, IEEE 802.11g, Bluetooth 2.0, 2.8 in x 0.7 in x 4.5 in, Stylus, Touch-screen, 4-way joystick

The Bottom Line: Though it won't appeal to the masses quite yet, the Nokia N800 Internet Tablet is a nice, portable device for on-the-go Web browsing, and it has some worthy upgrades.

Specs: Internet Tablet OS 2007, 128 MB, IEEE 802.11b, IEEE 802.11g, Bluetooth 2.0, 5.7 in x 0.5 in x 3 in, Stylus, Touch-screen

The Bottom Line: Though not ideal for the car, the ultraportable Mio H610 is an accurate navigator and a decent multimedia player for use on foot.

Specs: Microsoft Windows CE .NET 4.2 Core, 64 MB, Samsung 400 MHzS3C2440, Stylus, Touch-screen

The Bottom Line: Though the Pharos Drive GPS 140 has an accurate receiver and good Bluetooth integration, it will require patience on your part as it suffers from somewhat sluggish performance and an unintuitive interface.

Specs: Microsoft Windows Mobile 5.0, 64 MB, Samsung 400 MHzS3C2440, Bluetooth, 5.8 in x 1.1 in x 3.5 in, Touch-screen

The Bottom Line: The HP iPaq rx5900 Travel Companion delivers a sleek all-in-one navigation, productivity, and entertainment device to mobile professionals; we just wish it had better battery life.

Specs: Microsoft Windows Mobile 5.0 Premium Edition, 64 MB, Samsung 400 MHzS3C2442, IEEE 802.11b, IEEE 802.11g, Bluetooth 2.0 EDR, 3 in x 0.6 in x 4.7 in, Stylus, Touch-screen

The Bottom Line: The Sony Mylo offers nice messaging and multimedia features for students, but we're not sure that's enough.

Specs: 1 GB, IEEE 802.11b, 4.8 in x 0.9 in x 2.5 in, Keyboard

The Bottom Line: The Palm-based Garmin iQue 3000 is a competent organizer and navigator, but it's marred by mediocre performance and lacks some features that put it behind the competition.

Specs: Palm OS 5.2.1, 32 MB, ARM 200 MHzARM 9, IrDA, 2.8 in x 0.7 in x 4.7 in, Stylus, Touch-screen