Citizen scientists, under the project Planet Hunters launched last December, analyzed real scientific data collected by NASA's Kepler mission. The mission has been searching for planets beyond our own solar system - called exoplanets, since its launch in March 2009.
http://www.ummid.com/news/2011/September/22.09.2011/web_users_locate_planets.htm
http://www.ummid.com/news/2011/September/22.09.2011/web_users_locate_planets.htm