Where did that video come from?

Webjay - Find link source:

This is a tool to help bloggers who post their own audio and video. The problem to solve is that when other people link directly to the audio or video without a link back to the original blog, there is no way get back the blog features like a contact address, a comments form, the blogger's text describing the audio or video, or the trackback URL.

It's a start.