Free Rice

Try this if you have a few minutes to spare. It looks like a worthwhile thing to do, and it is fun to test one's vocab - you might even learn the meaning of a few new ones.

http://www.freerice.com

They donate ten grains of rice to the poor people of the world thoughUnited Nations for every word that you correctly match to itsmeaning. The better you are the harder the words though.