This is a really interesting project that uses an Arduino with an XBee to control an R/C airplane. You can purchase remote controls fairly inexpensively, but can they be infinitely hacked like an Arduino? How about 2-way communications? Think about all the cool sensors you could add!

Read more about the Arduino powered R/C airplane [hack a day]

In the Maker Shed:
Arduino Crop
Arduino Diecimila