Dorkbot Bristol (http://dorkbot.org/dorkbotbristol/) shows off its Arduino-powered musical bike (http://code.google.com/p/pisanomatic). Each note is triggered by polystyrene blocks passing through a motion sensor. You could do a two-wheeled version that would reward riding with a song.
Suneil Tagora of Open Sustainable Technologies (http://openenergymonitor.org) and Cardiff Wind (http://cardiffwindblogspot.com) demos his Open Energy Monitor
David Levin, CEO, United Business Media, talks with Robert Andrews and ContentNext's Future Of Business Media conference, October 2008, at New York City's Edison Ballroom
Michael came in to the front-row crowd a few times, I think three times, letting folk touch him up. Here's Losing My Religion, just after he graced us with his presence on my side of the barrier.