Alex,
An interesting book to read is "The Elegant Universe" - it's also available as a DVD (I have both). It tries to cover a lot of the GR / QM unification work that is being attempted by string and brane theory in layman's terms. I'll post more details if interested when I get home and have access to the book.
Like all attempts to explain extreme physics/maths in layman's terms it has to make assumptions about what the reader/viewer knows and also some approximations to simplify concepts, but I think it does a reasonable job. There are holes in the explanation where I don't understand things, and there are other bits that, for me, are a bit over simplified, but on the whole it's not bad.
Al.
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