I recently came across FreeRice.com.
I guess it is very cool and creative idea. It is cool because you can learn vocabulary and help end the world hunger. Yeah your read it correct! you can learn vocabulary and help end the world hunger. The idea is very creative. This is how it works- you go to FreeRice.com and play their vocabulary game. When you answer each question answered correctly 10 grains of rice will be donated by the sponsors to help people living in poverty. (I am not sure to which country though?) It is a win-win situation - you got to play the game, FreeRice get the good traffics, advertisers get their audience, and people in third world get the free rice. Please help to spread out the word. For more details, please read their FAQ page. The only issue I have is they should distribute rice in grams rather than 10 counts of rice as handful of rice may not fix the hunger until the site will get huge number of players/visitor. You can also track total rice donation by visiting this page.