iTurnU (iPhone/iPod) works much like a regular wii game. You have to jump, turn and squat to move your alter ego through different levels. Each level has a given time limit. In order to unlock the next level you have to cross the previous level in time.
This is one of the first apps to embrace a wii-like gaming experience on a iPhone/iPod. The gameplay is fairly solid, and the levels are quite challenging. The graphics could be better but work well on the display.
Overall it's a nice little app I can recommend.