The lectures by Leonard Susskind (one of the founders of string theory) are excellent: http://en.wikipedia.org/wiki/Leonard_Susskind#Lectures http://en.wikipedi

The lectures by Leonard Susskind (one of the founders of string theory) are excellent: http://en.wikipedia.org/wiki/Leonard_Susskind#Lectures http://en.wikipedia.org/wiki/Leonard_Susskind#Lectures He has a series of lectures that explain physics as understood by the modern theoretical physicist. He starts with classical mechanics, goes on to quantum mechanics, special & general relativity, statistical mechanics, and cosmology. The prerequisites are only high school mathematics, he explains the more advanced mathematics as he goes along. The physics that he teaches is condensed, but not dumbed down. It's really how a working theoretical physicist understands physics, "the real deal" as he says. Beware that it's very much a theoretician's viewpoint.