Stucon, over at core77, points out that Vodafone's latest handset in Japan will have tilt and acceleration sensors. While the intended application is gaming, there will be support for navigating the phone (with a cursor?!?) and launching applications.
Wouldn't it be great if natural gestures could be scripted in to it? Imagine: your phone is on the table and it rings; you don't want to take it so you simply turn it over to reject the caller and silence the ring. Or, to transfer a picture from your phone to your friends you just flick the phone in their direction. Or, by fidgeting with it in just the right way you get a canned rescue call to save you from that horrible blind date.