I had this idea sitting through another dull statistics lecture the other day: wouldn't the iPhone be perfect to emulate the kids game Bop-It? Its got something to sense hits(screen), and twists(accelerometer), and opportunities for crazier commands.
My ideas would be:
1) Bop It! (Hit the screen)
2) Twist it! (Turn iPhone away from self, then back)
3) Slide it! (Replacement for pull, slide a oversized slider across the screen)
What do you guys think? I think it's a pretty sweet idea - except for the whole dropping your phone thing when playing with many people :P
*I'd like to work on it if anyone would want to'
Oh, oh - and maybe you'd have to shout into the microphone occasionally :P