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Trackmate :: Simple Shoebox Sidekick
Laser cutter, start slicing stuff for under 50 dollars
How to make a solar iPod/iPhone charger -aka MightyMintyBoost
Weather proof, Bluetooth capable RFID reader
Interactive Multitouch Display
Trackmate :: Portable Plexi Cliffhanger
Light pole for treating SAD (Seasonal Affective Disorder, or, the winter blues)
Low-Cost Multi-touch Whiteboard using the Wii Remote
How to blend in with crowds.