Some interesting things I bookmarked on del.icio.us on February 25th, 2008:

• Heartbeat MIDI Controller - IR photo sensor+opamp+ very small midi controller detect a heartbeat, and MIDI send.

Heartbeat MIDI Controller. Watch the YouTube video here.

• Roland TR-505 modular - This Roland TR-505 project involved circuit bending the 505, recasing into an old mixer, and adding two synth circuits. The Remco sound effect generator was added, along with an Atari Punk console.
• ABSOLUT MACHINES - Amazing robotic, web connected ping-pong tossing musical instrument, a large-scale electromechanical sculpture.
• Blt Razendit » CamTheremin - CamTheremin is a freeware program simulating the instrument “theremin” with a webcamera. Touch the sensor lines (drawn into your webcam’s picture) to control pitch and volume of the generated sound.