Few PDA-phones live up to their promise of dual functionality. The Treo 600 is one exception; another is the new Sony Ericsson P910, which will be available this winter for U.S. GSM carriers. (Check www.expansys-usa.com for an unlocked model.) I imported the previous generation, the P900, and loved its built-in Bluetooth and Symbian OS, which is better at multitasking than the Treo's Palm OS--I could surf the Web, use IM, and listen to music at the same time. The P910 just gets better, with a smaller form factor, built-in Qwerty keyboard, brighter 262,000-color screen, more internal memory (64MB versus 16MB) and MemoryStick DUO Pro support. My favorite part: All my P900 accessories work with the P910. And as you can see, I have quite a few.