look at this! http://video.on.nytimes.com/?fr_story=ecb3026a6cd73014217a8e2a0396e0fc5f4c22cd
holy crap that thing is awesome!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
http://www.metacafe.com/tags/smart_pen/
an older thing, from 1998: http://www.cnn.com/TECH/computing/9810/16/smartpen.idg/