A book I'm reading now is Dhalgren by Samuel Delany, which I got from the library. It's about a city that's cut off from the rest of the world. It deliberately goes into some disorienting passages, and back in the early seventies the science fiction world wasn't ready for the kind of sex it was presenting either. Actually, sci-fi elements are kind of spare. That said, the scorpions, which disguise people as huge mecha monsters, are a pretty badass idea. Even though Philip K. Dick reportedly threw his copy at the wall when he tried to read it, I think I may make it through.
Update: Minor (or not) correction. According to the Wikipedia article, Harlan Ellison is the one who claimed to have thrown it against the wall, although Dick didn't like it either.