I have thought on a game for the iPhone taking advantage of that tactile screen. The iPhone is a amazing portatil device that even detect inclination, rotating. My idea is that:

A game about many spider walking over a plataform you must throw them away shaking the iPhone. Some of that spider holds to the plataform so its gonna be more hard throw them. Shake carefull, ¬Ącause you don¬Ąt want an iPhone toss casuality.
I haven¬Ąt do anything ¬Ącause I have not the materials to do it ( libraries, DevPaks, programming language )

If One of you could do it, It shall be just fine