[bederoso]

Duolingo has an also cool approach, where they offer free language courses for students, and charge companies that want certain documents translated.

The students themselves translate those documents as part of the course, and once a consensus is reached (a given amount of students came up with the same translation) the document is returned to the submitter, who pays for its translation.

http://www.duolingo.com/info

Almost like how recaptcha works :-)

[vasco_]

Both recaptcha and duolingo were started by the brilliant Louis Von Ahn. I am a big fan of his work. He was the inspiration for my first startup, while at CMU.