Carrier: AT&T
One problem with the Tilt (and to a lesser extent, the iPhone) is that it's not really cell phone size. That's not the case with Pantech's Duo C810, which is almost as slim and trim as your typical slider phone yet as capable as the Tilt. In fact, it's kind of a slider times two. Hold it in the traditional fashion, and the screen slides up to reveal a numeric keypad. Turn it on its side, and the screen slides to the right to reveal a backlit QWERTY keyboard, while the display adjusts 90 degrees to match. Like the Tilt it runs Windows Mobile 6, so you can surf the Net, download e-mail, and even watch live TV (though you'll need to fork out another $10 per month for MobiTV). The keyboard is a tad small, so you probably won't use it to work on your novel. But for short e-mail and text messages, it's fine. With Bluetooth, a 1.3-megapixel camera, and 3G support, the $200 Duo (with a two-year contract) is both slick and relatively inexpensive.
Comparable models: Helio Ocean, Samsung SCH-i760 (Verizon) 
3. LG Voyager VX10000
Carrier: Verizon Wireless
If I seem obsessed with phones that have hidden QWERTY keyboards, it may be because I've spent too much time tapping out text messages on tiny cell keypads. The LG Voyager sports an iPhone-like touch screen on the outside, and flips open clamshell-style to reveal a screen and a full keyboard on the inside. One of the increasingly rare smart phones that do not run Windows Mobile, the Voyager comes with a slew of useful applets: You can record voice memos, set alarms, calculate tips, snap 2-megapixel photos, and use its integrated GPS when you get lost. Full media capabilities are available via Verizon's V-Cast mobile TV and music service (starting at $15 per month), and you can play your own MP3s and WMA files too. The Voyager costs around $300 with a two-year plan, but since it lacks Wi-Fi, you're stuck paying for Verizon's 3G network when you want to surf the Web. You also can't sync your contacts or calendar with Outlook, making the Voyager more suitable for play than work.
Comparable models: Sprint HTC Touch, Samsung SCH-u740 (Verizon)