This is a great video site showing the life and careers of famous scientists. Find out about Richard Feynman, Rosalind Franklin, Gregor Mendel and even Mister Spock in interviews with scientists in their field today.
http://ictmagic.wikispaces.com/Science
A new project from Bill Gates that provides a series of video lectures to "explore core scientific concepts and theories". Includes "..searchable videos, transcripts, notes and interactive extras." Free, requires installing a Microsoft plug-in called Silverlight.