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I was surprised that they put string theory near the start....I had a quick read, and it seems well written (with links to the equations, if you are interested).
I don't know how rigorously the information on the site has been verified but I think this thread is worthy of being pinned for future reference. At least as a first reference.
Mr. Peter, even the second website (http://www.learner.org/courses/physics/) is kind of like a university website since the course is designed by professors from Harvard Smithsonian center for astrophysics and MIT etc. (http://www.learner.org/courses/physics/scientist/index.html).