FluidTunes is a freeware application for Mac OS X that can control iTunes through a camera with your hands, head or feet.
Swipe your hand from left to right or right to left over the screen center to scrub.
Wave quickly at buttons to activate them.
Without using a keyboard or mouse, you can navigate through your music and play or pause songs.
Tapestry - Shapeshifter - http://www.shapeshifter.co.nz
Dark Days - Fat Freddy's Drop - http://www.fatfreddysdrop.com