All the major video hosting websites can be searched using a single website – VDoogle. When talking about major video hosting websites, of course, it includes YouTube, Google Videos and iFilm.
Interface looks very much like the Google Custom Search.
After searching the videos, you can see a string at right side saying –
Google search results customized by VDoogle Shared Video Search using Google Co-op
It is using Google Co-op service, I mean Google Custom Search :).