Toscanini:
Texas Instruments EZ430-Chronos as a $50 wireless gestural controller
The EZ430 is a wristwatch with a built in accelerometer, temperature gage and low-power rf transmitter. With a serial port dongle you can stream live data from the wrist-watch to your computer.
I plan to write a MAX/MSP sketch that takes the accelerometer data and turns it into a midi signal.
http://github.com/lindseymysse/Toscanini
Texas Instruments EZ430-Chronos
Max/MSP