I wasn't sure if this had already made its way to the forums so I thought I'd just give a shout about it! It's a dead simple app that transmits compass, gyro and accelerometer data using OSC. In a quick experiment, I used the compass data for a point-to-pan patch: point to a speaker to pan to it!

Great stuff, check it out:

http://www.kevinschlei.com/bitshapesoftware/instruments/gyrosc/