NASA's Goddard Flight Center has just issued a contract to use Touch User Interface technology from a company called Somatic Digital. Their "TouchBooks" let printed material connect to digital devices via sensors in the covers. (C'mon, don't tell me you've never pressed on a URL on a printed page and expected something to happen.) This page on the vendor's site has videos of a 7-year-old using a TouchBook. Works with XP and OS X.