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Probably the most helpful resource online for me academically has been Wikipedia. I have had TAs and professors who recommended reading specific Wikipedia articles to brush up on related topics, especially in math classes.

There is a demand for this kind of thing outside of just high-school. I'm not in a position to go back to high-school or university, but I'd like (and would pay) to be able to "study along" with other people on a course/textbook.

(This is partly a lazyweb request - if this exists, someone tell me where!)

As would I. Kind of like a crossfit.com or dailyburn for education. Social, community based learning.

I wish I had access to Khan Academy (http://www.khanacademy.org/) back when I was in high-school.

Not a direct answer to your question but I like this website for 'explain the math' type articles.

http://betterexplained.com/

(The author is HN user kalid.)