Hey Josh...
If that kind of stuff interests you, then I heartily recommend the book "The Elegant Universe" by Brian Green.
It is a laymans desciption of Superstring theory, which covers Einsteins' General and Special Theories of Relativity AND Quantum Mechanics. It's a very complicated subject, but he does a pretty good job explaining it all.
And the concept of time slowing down as you approach the speed of light is nothing compared to what gravity REALLY is.... and the theory that the fabric of the universe has 11 dimensions. I loved it!
BTW - Green also did a series that was shown on SBS... you can get the DVD at some bookstores.