I like the idea too. Luis Von Ahn has done some work on tricking people to do useful things through play. 2 examples I can think of are Google Image Labeler(h

I like the idea too. Luis Von Ahn has done some work on tricking people to do useful things through play. 2 examples I can think of are Google Image Labeler(http://images.google.com/imagelabeler/ http://images.google.com/imagelabeler/), in which people provide useful metadata about random images on the web, and reCaptcha (http://recaptcha.net/ http://recaptcha.net/), where captcha solutions are used to digitize parts of books where OCR fails.