youtube is not video search engine, it is a video hosting sites. Youtube shows only their own videos, not from other video other sites, however search engine extract videos from various video hosting sites.
i have beusing all the major tubes but i think the best and most content is available on Youtube only!
Video search engine means which search only videos.
I think what CSCGal was questioning was the existence of such an animal. To my knowledge, beyond YouTube, Vimeo and and the ability to seach videos only in the big 3 SE's, I have never heard of a video-only search engine.
As has been pointed out elsewhere in this thread, YouTube is NOT a search engine; it is a video hosting resource with an integrated search facility allowing users to search for videos ON YouTube.
On the other hand blinkx is a specialised search engine; submit your search term there and it will return results from YouTube, GoogleVideo, MetaCafe, MSN Video, DailyMotion and dozens of other video hosting sites.
Blinkx presents an opportunity to view videos from all of the major (and many of the smaller) video hosting sites in one window. Try it - you might be surprised at just how good it is.