Google Image Labeler is profoundly addictive. If you want to try something totally different and new(ish) then give this a try: http://images.google.com/imagelabeler/
Essentially you say “Go” and Google will find a partner for you to play with from somewhere in this fine world. As soon as the person joins you are both given the same image which you have to describe using words. As soon as you both enter the same descriptive word you receive points and are moved onto the next image. What is the catch? You only have one minute and 30 seconds per game. So you have to get as many matches as you can in a minute and a half.
It sounds crazy boring but just you wait!
I hope you don’t hate me for introducing you to this cute little addiction.