The Parrot AR.Drone is a helicopter that connects to your iPhone via WiFi and enables you to control the helicopter via the iPhone display. The iPhone display is your controller.

It has built-in cameras and ultrasound sensors that lets you take full control of the helicopter. I doubt that the iPhone will be the only device capable of controlling the helicopter in the future as it only uses WiFi, I think we will see an Android App for this soon, and even a PC App.