ImageLabeler and tagging games

The biggest obstacle to implementing metadata-driven systems is getting those who have the best knowledge to actually enter the metadata. Entering metadata for content is widely seen as a chore, and that grumbling sound you hear is the sound of all those users whose managers have made the metadata mandatory.

I just stumbled across Google Image Labeler. It turns image metadata entry into a game, where you're paired with another player and compete to produce matching metadata for a given image. (I'm sure Google doesn't throw away the metadata that doesn't match, either.)

There's a good explanation by Michael Mahemoff at Ajaxian.com.