This isn't out yet, but this is a way cool app that's being made for the iPhone. It's an RC helicopter that uses WiFi and the accelerometer to control it. There are video cameras on the helicopter that sends the signal back to the phone. You can learn more about it (and see videos of it in operation) at Parrot AR.Drone - Quadrotor helicopter with wifi and 2 cameras - AR.Drone games for iPhone and iPod touch