I'm thinking the multiplayer possibilities... nice :P
think of each genre, and think how this could not work...
racing... I think everyone has/has witnessed people trying to steer by moving the pad
shooter - point and click... BANG :P
flying - tilt, lift and allow to fall down
sport games (particularly holding sticks rackets etc
strategy games control units directly.
can't think of a game the control couldn't be used in to be honest.
actually, think bout it, it will be a bit like minority report, just a little bit more basic :P