If you're into sci-fi you should check out Stanislaw Lem. Polish author who wrote Solaris. It's his best book, and it's really quite good.
I've read Khaled Hosseini, and those two books are great, they are set in the middle east.
I definitely owe my love of reading to CS Lewis and Brian Jaques. the Redwall books and Narnia are great to read over and over and over... especially as a kid.
We did a lot of reading in AP Lit and I found my favorite author we read is Tim O'Brien. He's the guy that wrote The Things They Carried which is a great book but the rest of his stuff is great also. It's mostly about Vietnam.
Cormac McCarthy's new book The Road is also highly recommended. It's dark, depressing, and sometimes a bit creepy and scary but it's also very uplifting.
The Bourne Series by Ludlum is good, and let me tell you, it's nothing like the movies at all, so even if you've seen all the Bourne Movies, you can still read the books because they share very little in common.
War & Peace. I thought it was going to be drudgery, but really the characters, plot and the implications are all very accessible and easy to get into. I was pleasantly surprised by it, I really was. It's quite an endearing piece of literature. Tolstoy is superb, and the translator Anthony Briggs (if you buy the penguin edition) has such a nice turn of phrase, he really makes the sentences into little masterpieces of their own. It really has gotten under my skin, and even though I'm only 1/3 through it, I can't understand it's bad reputation.
My two favorite books from High School were spinoffs. Grendel by John Gardner takes the perspective of the monster Grendel from the epic poem Beowulf. It's a really interesting read, and very philosophical. It's also composed of very nice vocabulary, guaranteed to make you a better reader. The other spinoff is called Rosencrantz and Guildenstern are Dead by Tom Stoppard. It's about two minor characters from Shakespeare's Hamlet and it's another philosophically interesting piece with some great irony and pun. Tom Stoppard is surprisingly humerous without losing his ability to make you go "whoa, thats a really good line..."
Aaanyways... hope that wasn't too boring. But I do like this topic...