Though controlling an RC heli with your iPhone is about as awesome as it gets, more interesting is the fact that it runs Linux and that they're releasing an SDK :) http://www.ardrone.org/parrot-ar-drone/dev/developers
I've recently been doing some research into building one of these things myself. Some resources if anyone's interested:
What happens when you invariably fly out of range of your BT or wifi network?
Simply Amazing! Not that I don't like the iPhone but wouldn't it be cool to have a controllers that can do this for all kinds of vehicles and suchlike? I guess AR might be a boon to the remote control industry.