Earlier this week we predicted 2010 would be the year of Robotics moving up into the forefront of a networked world (point 13 here). We had no inkling of this device then, but here is a 4-rotor helicopter drone robot, controlled via the sensors on an iPhone and using WiFi for control transmission to the device.
For the aeronautical fundis among you, having 2 blades allows contra-rotation so that the body doesn't spin about its rotor, having 4 blades allows it to manage its airborne stability very simply. The big ship in Avatar had such an arrangement, albeit its blades were shrouded.
Quid Est Demonstratum - (literally - check out the video)