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The quantity and quality of content Khan produces is astounding. I've found the videos useful for reviewing linear algebra and probability problems.

Besides wikipedia he's one of the best things to come out of the internet from an educational point of view. Simply amazing.

Agreed. Also on my list: PlanetMath and MathWorld.

It would be nice to have a list of such sites!

Agreed. I've been guilty of spending numerous hours going through his videos and (re)learning a great deal in the process.

Someone should translate his videos into other languages and spread the wealth of knowledge he helps create.