Sergei Lukyanenko, Herman Hesse, Neil Gaiman, Locke, Ray Bradbury, Jonathan Swift, Stephen King, Lawrence of Arabia, Frank Herbert, Terry Prachett, Alexander Pope, Douglas Adams... among others. Those are just the ones off the top of my head. D:
I really love fiction, but I also enjoy philosophical and satirical essays. I'm kind of into Shakespeare, but I don't think I can read anything of his after Macbeth. It was just so good I keep comparing the rest to it. Books that make me think, or laugh, are the best. Or laugh and think!
I'd have to say Ray Bradbury's Fahrenheit 451 is my favorite. Not only because it was like eating candy every time I read, but also because every time I pick up a book now I think of it. When I argue that more people should read books, I often quote it. It's perhaps the most rememberable book that I've read, though maybe not the one that made the most impact. There, it would tie up with Herman Hesse's Siddartha.
I am a giant blibliophile, and proud of it. <3