DailyMotion, Metacafe, Vimeo, and other video sharing websites may not be as big as YouTube but they still have a great fan following and host tons of video clips that may well be of your interest.
We often ignore searching video content on these "non-YouTube" sites because of lack of time - fortunately, this problem is now a thing of the past with uLinkx - a comprehensive video search engine to help you conveniently search multiple video websites from one place.
uLinkx provides RSS search feeds for your video search queries. And you can also watch any of these videos without leaving the uLinkx website - no more hitting the back or forward buttons in your browser.
My favorite feature is the Live Video search which is like a common wrapper for all video sharing sites. You execute a live query on YouTube or sites right inside uLinkx.
Other than video search, uLinkx can be used for bookmarking video clips from multiple sites or organizing them in video playlists. [image a single playlist that streams videos clips coming from different sources like YouTube, Metacafe and Google Video]
Wishlist - more customizable RSS feeds and support for BrightCove and Blip.tv. I also faced problems subscribing to the Video search feeds in Newsgator but they worked fine inside Google Personalized homepage.
Update: uLinkx is no longer available but you can use Bing Videos for video search.