Bioscreencast and Multimedia@Harvard
Deepak and Harijay have posted about Bioscreencast, a project they were involved with. It is a repository for science related screencast. A screencast is video capturing the output of your screen usually with some audio narration to explain to the viewer what
it is being shown. They hope it will be used by scientists to share knowledge on how to use science related computer tools.
On a related note Ricardo posted a nice review on multimedia sites for science. He linked to this amazing video of the inner working of the cell:
You can see the full (narrated) version of this movie along with other science media files in this Multimedia Production Site at Harvard.