The CassioPeia Project is a project that provides high quality science education videos available to anyone.

It was started in 2008 and has over 100 videos available on their site for download, on iTunes, and on YouTube. Topics range from quantum mechanics to chemistry to general physics. Their slogan is "No science teacher left behind" and they are funded by an anonymous retired scientist.

All of the content is open-source and educators are encouraged to customize the videos for their needs.

This is a great resource for anyone teaching, or learning, science.

OpenCulture, a great resource for lots of things, has a nice article on "125 Great Science Videos".

The videos are arranged by topic and have short description about the video. Topics include: Astronomy, Physics, Biology, Chemistry, Environmental and more. The videos are all free to access.

There are some really great videos listed here and this is a great list to share.