Google TechTalks July 26, 2006
The talk given at Google on Human Computation. Luis von Ahn from CMU discuss how to encourage people to participate in Human Computation and gain fun and profit from them. He speaks very fast but very clearly and concisely, and I like that.
I myself played a couple of games at the sites he built, and found that it is actually very fun to be part of human computation. Ah, I really want to write a paper like his.