Like English vocabulary? Ok, don't like English vocabulary but want to learn some? Ok, don't like English vocabulary and don't want to learn some, but would you be willing to try to feed the hungry?
FreeRice.com lets you play a multiple choice English vocabulary game and feed the hungry at the same time. For each word you get right, they donate 10 grains of rice to help end world hunger.
Right now, I'm up to 600 grains.