Fermat's spiral
An applet to play with and learn about this curve, and the intriguing patterns that it creates in nature
soundsieve
A music browser that shows pictures of the audio inside the songs you listen to every day
Visualizing music
Seeing the structure inside your music
Sleep tracker
Where I wear accelerometers while I sleep, then make graphs of my movements
Continuous keyboard
A musical instrument that you play with LEDs on your fingertips
Last.fm dashboard widget (with Ian Brown)
Track what all your friends are listening to, in one place
Robot dribbling a ball
A robotic arm that bounces a ball every time it senses one is present