Forbes blogger TJ McCue sent us a link to this awesome Kinect project with gesture-controls an S107 RC Helicopter. The builder, cdoughty29 on YouTube, writes:

The Kinect detects my hands, head, and hips. This information is translated into X, Y, Z coordinates, processed with some 7th grade Algebra, and then sent to the Arduino Uno over the serial port. The Arduino receives the signal and converts it to a 38 kHz Infrared signal that the S107 can understand.

Nifty. Thanks, TJ!