Google Image Labeler

Looking for a "productive" way to waste time? Want to contribute to the unending task of tagging everything on the internet? Please check out the Google Image Labeler:

http://images.google.com/imagelabeler/

You are matched up with a partner for two minutes. During the two minutes, you are shown a series of photos which need more tags, if the two of you enter the same tag then it gets added and you move onto the next picture. You get an arbitrary amount of points for the different complexity of words that you both guess.