Among the books I read during the school year that just ended, I read almost the entire Discworld series - everything except the young adult books (which are sitting on the desk in my room waiting for me to read them), Where's My Cow?, and the art book. The year before that, I read through the Left Behind series, Isaac Asimov's Robot and Foundation series (never did get into the Empire books), and the Sandman series (I read a few other graphic novels, including The Dead Boy Detectives, V for Vendetta, and Watchmen). During my freshman year, I read all of the Dune books except for Hunters of Dune and Sandworms of Dune, since they weren't out yet (I've since read them, and still don't know what to think of all of the prequels and sequels written by Brian Herbert). Since I haven't read them yet, I'll probably read the Dark Tower books next year, taking a break at some point if Raising Taxes (the next Discworld book) comes out while I'm still reading them.
...I also read a lot of manga. Death Note pretty much sucked, Naruto is much better when you don't have to hear "BELIEVE IT!" every ten seconds (note: I have never watched the anime, only heard it coming from the room next to this one), JoJo's Bizarre Adventure is freaking awesome and I need to get volume 6, Buddha is pretty cool, Azumanga Daioh was hilarious, and I still need to read past volume 3 of Yotsuba&!...and then there's all the other stuff I read or have read that I'm not going into any sort of detail about right now, including Fruits Basket, Tsubasa: Reservoir Chronicle, Chobits, Love Hina, Negima!, Cromartie High School, Initial D, and the first Star Trek manga...also, there's a very large manga called Ode to Kirihito sitting in front of me that I'll probably start reading later today.