Duolingo is a cool project created by the same guy that did ReCaptcha. With it, you help to translate the web while learning a new language at the same time. Right now there are only a few languages though.
There's also a TED Talk on it:
http://videosift.com/video/Luis-von-Ahn-Massive-scale-online-collaboration
(Lann) 11 months 2 weeks ago • 1,293 views • 2:05
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