You know, I thought the title was something to do with a Jobs scam, considering that most would think an invisible mouse would be free, but this actually does seem pretty good, although a bit uncomfortable.
It's cool curiosity, but is not practical to be forced to align a camera and the hand.
It would not work with the hand over the leg, in bed, or in non planar surfaces.
Looks like the same guy who developed Sixth Sense. Hope he plans to make this software open source as well. Really innovative stuff, can't wait for the next level with a better camera.