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Building a Medieval Gauntlet
Instant Land Windsurfer
Solar Powered Trike
Self balancing one wheeled electric skateboard
The Curiously Strong Trebuchet: A Pocket Sized Medieval Siege Engine
Make Your Own Biodiesel Processor
Rubber-band Powered Butterfly
Control Your Robot Using a Wii Nunchuck (and an Arduino)
Arduino Controlled Servo Robot (SERB)
Awesome led cube
3-D Laser Scanner
Start a fire with air
Steam Powered Potato Pistol 1.0
How to Make Fire Balls! Really Cool!