Talk about a cool, useful and fun website, look no further than Free Rice. Go there, and guess the meaning of a word. Get it right, and 10 grains of rice are donated to people who need food around the world by the United Nation. Keep playing and getting the vocabulary answers correct...more rice is donated.
In the past month since it's inception, Free Rice is now up to nearly 60,000,000 grains of rice a day donated. For those of you who are interested, the donation is handled by the advertisers from their website.
What a great site...and a great cause...and a fun way to increase your vocabulary.