Cormac McCarthy's The Road. Anything by Bret Easton Ellis.
Fair warning to anyone considering a foray into Bret Eason Ellis' work: reading Less Than Zero is going to leave you with the feeling of an irreparable void in the pit that was once your stomach, but is now only a vacant space where your faith in humanity once resided. That being said, I do highly recommend it.
Aaaand, now Less Than Zero is near the top of my wish list (right behind Neuromancer). I think that is just the type of reading I need to help me with what I'm going through right now.
I currently reading Time Out of Hand: Revolution and Reaction in Southeast Asia.. I'm about four chapters in and I like it so far. I'm definitely learning a lot about a culture I didn't know very well. I'm also reading through this because I need a balance of fiction/non-fiction.
The Road is an attempt to make simplicity seem profound, and an exercise in which Cormac McCarthy sees just how far he can go without replacing his broken typewriter. Next he will give up on full stops and commas.
The Road is the most heartbreaking thing I think I've ever read. It's a terrifying journey into the primal nature of mankind. You keep reading, hoping for salvation that may or may not be granted. It shares many themes as Cormac's No Country For Old Men and manages to make them even darker. Great novel. Still haunts me from time to time.