Randy Sarafan, who also happens to be the Technology Editor over on Instructables, gutted a remote-controlled car and swapped the parts for an Arduino board.

A perl script running on the iPhone will then send the command to the Arduino. When it receives the start command, the Arduino will ground the wire to the remote start and fire up the car.

As far as consumer humanoid robots go, Aldebaran Robotics' NAO is certainly one of the more capable. Now, the li'l bot can also drive a car – if that car is its new miniature electric BMW Z4.