I am seriously addicted!
Change the nickname to whatever you want and start labelling!
It is really fun.
You are matched with a random person who is online and both of you work together to tag the same image. You move on when you and your partner match a tag. You earn points for how detailed the tag is. You tag images with your partner for 2 minutes, after that you see your partners previous tags, then you start again with a new partner.
It is a great way to relieve boredom and pass the time. Give it a go and tell me what you think.
http://images.google.com/imagelabeler/