1. To Kill a Mockingbird. It's amazing, especially given the time period it was written for. Just amazing.
2. At the Mountains of Madness. While lacking the qualities of the more "famous" parts of the mythos, this is one of my favorites of Lovecraft's works, being the one I started out reading, and also the way he described the behaviour of the montsers at hand with both admiration and terror. Science fiction at it's fundamental roots, and perhaps, at it best.
3. Roadside Picnic. A book about scientific anomalies. S.T.A.L.K.E.R., a video game based on this, really can't even compare to the amazingness of this book.
4. Pickman's Model. Ever heard of the kind, nature-loving elves that left their babies in the forest so that a human might take care of them, or traded children with a human? Those kids were called changelings. If these details apply to the ways changelings work in your mind, and that the elves are the beautiful people, take those notions and shove them somewhere, (preferrably not your ass, because that would hurt,) for the duration of this book.
5. The Jeeves and Wooster series by P.G. Wodehouse. Its humor is absolutely wonderful, like Collegehumor, it has the miraculous ability to let me both laugh and cringe at the same time. It's like Diary of a Wimpy Kid for intellectuals.
6. I have no Mouth and I must Scream. The game was based so loosely on the book that it was physically and mentally painful for me to play. Don't let the game befuddle your idea of the story. The book was better.
7. Spiderman #121-122. I actually went through 2 of the 5 stages of grief before being able to read another spiderman comic again, even though I heard rumors before from my comic-book-nerd cousin who let me read the comics in order.
8. The Watchmen. If you're highly religious, I suggest you don't read this comic, but otherwise, it's one of the best ones out there. I actually felt the sort of paranoia as if I actually were a US citizen during the cold war.
9. V for Vendetta. Not only is the untrditional superhero ass-kicking, but I was nearly a converted anarchist by the end of the book. It just made sense. Were it not for how emotionally affected I was by Spiderman, these would easily be ahead of it on my list.