http://prize-competitions.com/

http://www.theprizefinder.com/

http://www.xprize.org/about/x-prizes

http://en.wikipedia.org/wiki/Netflix_Prize

http://www.loebner.net/Prizef/loebner-prize.html

http://www.earplay.org/competitions/index.htm

http://www.berkeleyprize.org/

http://www.gamblingcommission.gov.uk/pdf/Prize%20competitions%20and%20free%20draws%20-%20The%20requirements%20of%20the%20Gambling%20Act%202005%20-%20December%202009.pdf

http://www.catchthatprize.co.uk/index.php

http://en.wikipedia.org/wiki/X_Prize_Foundation