Teachers Domain (you need to register) Teachers Domain is a great resource for downloading or streaming video. Most of the content is for science, but they have recently added reading,math,writing, and social studies. A great feature is that all of the videos have questions. Just cut and paste the questions into a word document. If you need help with this site please contact us.
National Geographic (a variety of useful videos)
iCue (variety of history,gov't,writing, and political videos)
National Geographic Kids (tons of great animal videos)
History.Com-Short Useful Videos (short advertisements before video)
Teachers.tv With over 2000 videos available online, the Teachers TV website is an invaluable resource for any busy education professional---UK.
Documentary Films
PBS Teachers
TeacherTube