http://images.google.com/imagelabeler/ – Google’s new tool.

How does it work?
You’ll be randomly paired with a partner who’s online and using the feature. Over a 90-second period, you and your partner will be shown the same set of images and asked to provide as many labels as possible to describe each image you see. When your label matches your partner’s label, you’ll earn some points and move on to the next image until time runs out. After time expires, you can explore the images you’ve seen and the websites where those images were found. And we’ll show you the points you’ve earned throughout the session.

This tells you that you can never be better than your team/partner. I tried it and scorded

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points (hey, thats because I was testing it :)). You can give it a try too.