If it one thing that the 770 has taught me about UI design, it's that onscreen keyboards are easy to implement and use. Even so, little chicklet plastic keys are faster to type on. For gross gestures and modal interface controls, the touch screen is great (better than alternatives like the joystick and mousing). The UI can respond accordingly, when control are grabbed or manipulated.
Typing is a different activity than UI navigation. For me, I mostly touch types. I'd rather be focusing on the output while my fingers are busy with the input, so tactile rather than visual feedback is important and the area under my fingers is not the target of visual attention. Maybe there are interfaces that are better (faster requiring less attention) than typing, but for now a competent typist is still faster with a crap chicklet keyboard then someone typing on a screen keyboard that's obscuring half the display, area.
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