I've seen people use IR to re-program Arduino boards before, and I think it would be pretty cool if someone wrote a self-replicating program that could be passed on just by standing in front of another attendee for the length of a normal short conversation. I'm guessing someone could come up with a pretty interesting/artistic use for a botnet of a few hundred Arduino badges in one location.
I want to see a simple mesh network running across the badges, or maybe some stationary base stations that use signal strength to real time track each badge at the conf - and a big map overhead showing you where everyone is. Page a badge and it shows up on the map for approx location. That is going to be a fun conf.
Curious as to how much these cost to produce? I have been playing around with some Arduinos and it seems like getting something set up with wireless and a rechargeable battery is a lot more expensive than it should be. Would be cool to have an all-in-one solution for this.
Cool... reminds me of DEFCON's ninja badge which used 2.4 GHz zigbee to talk to other ninja badges at the conference.<p><a href="http://ninjas.org/badges/defcon18.html" rel="nofollow">http://ninjas.org/badges/defcon18.html</a>