Mechanical Turk

There is a post on O'Reilly Radar on an amazon service called Mechanical Turk. Basically it provides a service for getting lots of humans to work on problems that machines find difficult. I've had this idea in my own research a number of times, and it is great that one of the 'big boys' is trying it out. It seems it is targeted at getting users to work on the problems (by paying them in micro-payments) - great idea!