I read a biography on Winston Churchill a while ago, although the name escapes me at the moment. It wasn't a complete biography--just one that covered the time around when he became prime minister and was deciding how to handle Germany. Very interesting. Funny how he was able to make it into power just when the country seemed to need him the most and then he just kind of faded away after the war was over.
I like biographies in general. The biographies that Barnes & Noble distribute are pretty good, and sometimes you can find them at good prices in their bargain section. That's where I picked up the Autobiography of Benjamin Franklin (an interesting and witty read), a biography on Mozart, and a book on Escher.
I also like science books. I've got a few books on how the mind develops as well as one on forensic science. Fascinating stuff....
As far as fiction goes, I prefer the Classics, such as the likes of the authors Hardy, Elliott, Bronte, Orczy, or Austen (although after reading a couple of her books they're all essentially the same), but am not opposed to a good mystery (Christie, Doyle). And who can not like Harry Potter or a little Dave Barry??
Since getting married, the library has grown to include a lot of Dahl, Grisham, Calvin and Hobbes, and law books.
The rest are mostly just random books from the B&N bargain section that sounded interesting, books I got as gifts, religious books, and books from school--a bunch on networking, programming, and computer theory. Now there's a little night-time reading for you.