In case you need yet another way to waste time, there’s an interesting game at http://www.peekaboom.org. You get partnered with a random player and you have to guess a word based on an image. Your partner reveals parts of the image to you and provides hints.
The game is actually part of an initiative to train a computer program how to recognize objects in images. I presume they take image labels provided by the Google Image Labeler. As part of the game, you’re telling them where those objects are in the image.
What’s funny is that my wife and I were both playing separately… and discovered we were partnered with each other!