Boing Boing has a link to a really addictive Google game where you and a random partner try to come up with the same label for a variety of images.
You have 90 seconds and each image you match with your partner, is worth 100 points.
Today's top pair has an amazing 3000 points (30 matches in 90 seconds), and the current top all time contributor is JoeBob with 1,444,600 points.