Free educational videos on various sciences

Lots of free videos on Physics, computer science, mathematics, nano technology, algorithms, programming languages, economics, History, engineering, material science, Culture, Geography, Photography etc.

http://freescienceonline.blogspot.com/

MIT Open Course war(OCW) video and audio courses:

http://ocw.mit.edu/OcwWeb/web/courses/av/index.htm

MIT lectures on Youtube:

http://www.youtube.com/profile_play_list?user=MIT

Stanford lectures on Youtube:

http://www.youtube.com/profile_play_list?user=stanforduniversity

Berkeley lab's videos on Youtube:

http://www.youtube.com/user/berkeleylab