The following are the best cell phone PDAs (in the same order) according to the PC World magazine. Most of them are smartphones with strong email and multimedia features. Some of them even support 3G, have a keyboard, camera and a touch screen.
RIM Blackberry 8300 Curve
T-Mobile Wing
T-Mobile Dash (Windows Mobile 6)
Nokia E62
Apple iPhone
Samsung Blackjack
Cingular 8525
T-Mobile Sidekick 3
RIM BlackBerry 8800
RIM BlackBerry 8700g