A Few Educational Videos:

The University of Nottingham

Bibledex - A video about every book in the Bible
and Youtube Channel

Periodic Table of Videos - Video for every element in the periodic table
and Youtube Channel

Sixty Symbols - Videos about the symbols of physics and astronomy
and Youtube Channel

Test Tube - Behind the scenes of science
and Youtube Channel

TED: - ideas worth spreading
(Technology, Entertainment, Design)

How to find Free Educational Videos on the Web - from About.com