Amazon Mechanical Turk : "Complete simple tasks that people do better than computers. And, get paid for it."
This is one of the ways that CAPTCHAs are solved by spammers and Amazon has turned it into a product. Wicked! The ways CAPTCHA are solved by spammers include but are not limited to asking people who want to see porn solve them framed from another site, employing people in places like Costa Rica to solve them all day as a "computer industry" job; and of course, using software to solve the test. (Which, according to Carnegie Mellon cannot be done.)
Anywhoo. It's cool to see an ingenius and useful technology idea reverse engineered from the secretous ways of our evil spam overlords.