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MIT Open courses, they're free and cover a wide range of subjects including math, science, humanities, etc.

This is a free site which has math videos as well as a whole practice system. It also includes videos for science, finance, humanities etc. so it could be a great site for a lot of people. It does require you to set up an account to access the content. There's an interesting story to the creation of this non-profit if you're interested here: http://www.youtube.com/watch?v=gM95HHI4gLk