The IR approach - nice idea, although not revolutionary nor unseen.
Multitouch - old, ooold, oooooold...
Gestures - there used to be a company called Fingerworks that used to make (& sell) replacement touch panel keyboards for PowerBooks (among other things)... Except typing, it supported quite a nifty batch of multi-finger gestures, for pointing, scrolling, rotating, zooming, dragging, copying, pasting and lots more. There were also specific sets of gestures for various apps, i.e. Photoshop, Maya, Emacs etc.
All other companies, like apple or microsoft, claiming they were the first or revolutionary (gesture-wise) are just delusional
See here:
http://www.fingerworks.com/userguides.html