The AR Drone Quadricopter (that's a four propeller helicopter to you and me) is a very cool device that is sure to be one of the year's hottest gadgets. It is controlled by either an iPhone or an iPod touch and boasts two cameras - one for controlling the device and another which streams images back to the iPhone/touch. Basically if you tilt the phone then the Quadricopter tilts, raise the iPhone and the copter rises etc.
It is going to be available in the second half of 2010 in both the US and the UK and works as either standalone remote control toy or as part of game.
There's a bit more about the device here