Stack Exchange (including Stack Overflow, etc.): http://stackexchange.com/ http://stackexchange.com/ One of Jeff Atwood's blog posts on the topic: http://www.c

Stack Exchange (including Stack Overflow, etc.): http://stackexchange.com/ http://stackexchange.com/ One of Jeff Atwood's blog posts on the topic: http://www.codinghorror.com/blog/2011/10/the-gamification.html http://www.codinghorror.com/blog/2011/10/the-gamification.ht...