Right now I am reading the first real, non-RPG book that I have read in months. It's Schultz & Peanuts, a biography of Charles Schultz, and it is fantastic. An extremely interesting book.
I used to be a very avid reader but as I get older it is harder for me.
*Stephen King. Yeah, I know, commercialist tripe, whatever. I still enjoy them, for the most part. Just because someone sells a bunch doesn't mean they are bad.
*Neil Gaiman. Particularly American Gods. Frac! Run to the library and get a copy of Anansi Boys, at least give it a try. It's not as mythology heavy as AG was, and in fact the tone and themes are completely different. It's not really a sequel and you might like it.
*David Sedaris. His essays are very humorous, but they are even better when you can hear him read them himself. His voice can be a bit off-putting at first but you get used to it.
*Chuck Palahniuk. I prefer his earlier stuff--Invisible Monsters, Survivor, Fight Club--to some of his middle works. But more recent books of his (Rant, Snuff, Pygmy) are also very good. I think Survivor is his best book, a great satire of fame and celebrity in America.
*William Gibson.
*Plays: Shakespeare, Tom Stoppard, David Mamet, Eugene O'Neill.
*Comics: Moore, Ennis (particularly his run on the Punisher), and sometimes Mark Millar.
In the last few years I've begun reading more nonfiction in an attempt to learn more. Biographies, history, etc. It's slow going.
Oh! And, of course, World War Z.