Fastr is a game that uses flickr images. It loads ten images that all share a common tag, one by one, and you guess what the tag is. When you guess right, the tag will turn blue, and you'll get points. The faster you guess, the more points you get. The points are reset every six minutes. You'll need to choose a player name before you can play. You can play using tags for multiple languages and for specific flickr groups.
Enough said. Try it. I'll probably see you there.