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BoingBoing have just posted a link to a video demonstration & explanation of Jeff Han multi-touch interaction. Watch video at TED Talks. The interaction demos have been seen before, but good to hear a rapid explanation from Jeff.
Previous posts on multi-touch interaction:
Multi-Touch Sensing through Frustrated Total Internal Reflection
Multi-Touch Interaction Roundup
tabulaTouch
Tangent
Jens Wunderling