[EAMiller]

Aaron Koblin, of the flight patterns visualization fame (http://www.aaronkoblin.com/work/flightpatterns/index.html) has a few art projects based on MTurk. Bicycle Built for Two Thousand was a project where each worker was asked to sing a tiny part of a song, without knowing what the song was, then the complete song was reconstructed: http://www.bicyclebuiltfortwothousand.com/