I don't really see the benefit of using handhelds with built in keyboards since typing would still be difficult. Since you can't use them like a keyboard with all your fingers (at least I wouldn't think).
For me, typing with the on screen keyboard is fine. But I mostly just use my Dell for playing games (Rayman and Siberian Strike X are awesome) and listening to music.
OK, I need to know, is it worth it to spring for an expensive handheld cuz it has a keyboard, or is it just as easy to use graffiti? Really, which one is faster, more convenient, etc, and by the way, how does it effect accidental key-hitting, five way navigators, and so on?