I just implemented archive.org and blip.tv and it rocks.
Archive has a very serious, research-oriented(but not only) database, with private collections and plenty of available formats for most videos.
The only problem I see with it is the 'picture coming soon' on 3/4 of the thumbs..
I hope it's true :)
That is not a problem with blip.tv, which is more youtube-like. You only get .flv on the other hand.
Anyway, I'm now lurking for another friendly streaming site. Any suggestions accepted :)