Watch Know is a new source of educational videos that was featured on Read Write Web on Saturday night. Watch Know is a collection of thousands of educational videos from across the Internet. Watch Know has broken down the collection into an easy-to-browse catalog. You can also use a standard search box to find videos. Although the site is gathering videos from all across the web from sites like National Geographic, many of the videos are drawn from YouTube. Having videos from YouTube may be an obstacle for some teachers who would like to use Watch Know in their classrooms.
If you would like to find some alternatives to YouTube that you might be able to use in school please see this list of 30+ Alternatives to YouTube.