Zelig

via TechCrunch » Motionbox - Best Online Video Sharing So Far:

Like YouTube and other services, Motionbox allows tagging of video files. But they also allow deep tagging of parts of video files. Open a file (see screenshot below) select a portion of the video, and tag it. Viewers later will be able to skip right to that clip of the video by clicking on the tag. Longer videos can now easily be broken down into linkable pieces. This is a huge leap forward over competiting services.