>>Cheez - I'm sure you've already heard about it (or perhaps read it), but Brian Greene's The Elegant Universe is a great (i.e. readable) book that talks about string theory the unification of the physical laws.
I'm currently reading that (Christmas gift). I just got into the chapter on string theory, but so far it is a pretty good book as compared to the other related books I've read (I think much more understandable than Hawking's books, but maybe only because I read those first...)