There's nothing similar in scale to Youtube, but you might find something to interest you on Veoh:
http://www.veoh.com
Google has its own video-sharing site:
http://video.google.co.uk/
When you use the search facility, Google automatically includes videos on Youtube. This can be useful in that you can just search the one site but it can also be irritating if you've already taken a look at what's available on Youtube.
To get the search facility to exclude videos from Youtube, you can either use 'Advanced Search' or simply add '-site:youtube.com' on to the end of your search string.
For example, searching for 'james bond' will find all 007 movies on both Youtube and Google. To restrict the search, so that it ignores results from Youtube, search for 'james bond -site:youtube.com'.
Chris