http://images.google.com/imagelabeler/
This really shows how stupid people are. It teams you up with a random person and you have to label the image. I have rarely found someone who knows what they are looking at. And you have to label the image based on a small thumbnail, making it impossible in some cases to identify the subject of the image. The only time I ever got matches was with very generic words "man, people, group, boat" things like that. Nobody seems to know any exact names for things. If you are feeling very happy, and just really want to get annoyed, play this game.
No Google, labelling all of your images man, dog, and person will not improve search results.