Crowdsourcing company CrowdFlower has completed 8m tasks in the past 12 months

"CrowdFlower says it has completed more than 8m tasks in the past year and managed 125,000 workers across labour pools including casual gamers, refugees in Africa and users of Amazon’s Mechanical Turk.
The startup has developed an algorithm that it says ensures the quality and reliability of the work done by tens of thousands of individual workers over the web as they earn money cracking large but often basic tasks such as checking the accuracy of directories and whether unlawful copyrighted images are being posted to websites."
Source: Financial Times Technology blog, 20th January 2010