nJoy also allows you to control your computer music by shaking your mobile in different directions.
It allows you to take over your comptuer with your mobile by sending keyboard and mouse key strokes, you can control the whole desktop with your mobile phone menus.
The nJoy works with a bluetooth connection, so you will need a bluetooth adapter hooked up to your PC. For now, the nJoy only works with the Nokia N95 and release date is not known yet.
nJoy Demonstration Video