This is kinda weird timing, but NetBSD has a driver for the "PS3 Eye" camera...
http://www.invisible.ca/space/netbsd...laystation-eye
http://hackaday.com/2008/09/30/ps3-e...am-on-windows/ (
Windows related, but mentions something about using it for multitouch?)
It's a very cheap device:
http://shop.ebay.co.uk/?_from=R40&_t...laystation+Eye
Hope that helps..
EDIT: Ignore me, I realized you were looking for a solution for a hobby electronics project... unfortunately I'm not aware of any such products.