The Yahoo video search service lets users narrow their query results by file formats–such as AVI, MPEG, Quicktime, Windows Media, and Real–size, and duration.Users can also choose to filter results based on Internet top level domains, so only results from .com Web sites would be listed, for example. The service also lets users narrow the search to a specific Web site. Finally, users can choose to let Yahoo exclude content unsuitable for minors.

They already have competition from
http://search.singingfish.com/sfw/home.jsp
And Altavista.com
http://www.altavista.com/video/default