I am interested in getting free labor out of users in the style of the espgame.org. For more on this, see: http://video.google.com/videoplay?docid=-8246463980976635143 An obvious step would be to extend the ESP Game to video. Of course, the service need not be a game. For example, consider two groups of people: those who wish to grammar check their documents and those who wish to learn English. To grammar check, one would submit the document and users trying to learn English can try to find errors in it and provide corrections. General agreement about certain sorts of errors might be viewed as making it more likely that those in fact are errors. Moreover, one can also look for agreement among corrections. People learning English would benefit by getting back feedback about how well their errors and corrections correlate with those from others. One could of course do something similar with code design say.