I found the link here atop my inbox. I have never heard of some of these sites, but I think the sift is a pretty glaring omission. As far as I know the sites don't have to actually host the original content to be included in this list (but I am not 100% sure about that).

http://blog.wired.com/business/2009/01/video-search-sm.html

Feel free to submit and vote for the sift on said site if you feel it is worth it.