Check out this website for access to tons of screened and cataloged educational videos for students and teachers. The site is free to use and so are the videos. They plan to catalog 10,000 videos by the end of 2010. They currently have over 33,000 indexed educational videos. Currently, they have a great selection of videos for all content areas and I was especially impressed with their Math, Science, English Language Arts, and Social Studies and History collections!
Visit www.watchknow.org and see what you think!