Minority Reportesque interface developed by Microsoft Research and Carnegie Mellon University

You can use the palm of your hand as a phone keypad, or as a tablet for jotting down brief notes.

Maps projected onto a wall can be panned and zoomed with the same finger motions that work with a conventional multitouch screen.

Source:
http://www.kurzweilai.net/wearable-projection-system-turns-any-surface-into-a-multitouch-interface