Vimeo: Video Tagging

Vimeo is del.icio.us meets Flickr in movie format:

This is a site for organizing and sharing your video clips. Vimeo also makes it easy to watch your friends' video clips, or to view clips that have common subject matter.

Apparently you can also assemble longer movies from the short clips, and even view "Automatic Movies" compiled based on a tag search (example tag: concert). Still in beta, but most certainly worth a little attention.