Clipul Video Search This pretty much does exactly what you would expect - it finds video clips for you. It's also a meta search engine, since it provides you with the option of searching YouTube, Daily Motion or Vimeo - though only after you have run the search - the default is a search on YouTube. It's rather limited though, since it doesn't provide a way to access more advanced search functions, and there didn't seem to be a 'safe' search option; a slight problem since there's a listing of recent searches available for people to see. Some of these may be NSFW.
However, if you want to run a search over 3 different engines, it's worth having a look at.