FreeRice.com donates money for food to the United Nations World Food Program. They’ve instituted an interesting program to collect the money for donation. They’ve setup a leveled vocabulary database and present a word and 4 possible single world definitions. For each correct answer they donate 10 grains of rice to the WFP. You can play as long as you’d like. Advertisers display either a logo or an ad at the bottom of the screen and in doing so are paying for the donations. According to the website, as of yesterday 137,769,030 grains of rice have been donated.
Certainly an interesting idea and hopefully one that catches on.