Oooh, I like this topic! I think I'll be stealing some of the books mentioned here and adding them to my reading queue.
Some of mine are:
The Hitchhiker's Guide to the Galaxy series, by Douglas Adams, who also happens to be my favorite author of all time (no matter how many times I read about the mattresses that flollop floopily, or about the real problem with time travel being which tense to use, I literally
)
The Ender's Game series of novels (including the Bean-centered books) by OSC
Catch-22 by Joseph Heller
Clan of the Cave Bear series by Jean Auel (first two are phenomenal, third is decent, and after the 4th it goes downhill, but still some of the most fascinating books I've ever read)
The Great Gatsby by, umm...someone I can't recall and I don't feel like googling it. ETA: F. Scott Fitzgerald!
Harry Potter by J.K. Rowling (shut up you!!)
PS: In case you would like to
as well, please enjoy the following excerpt from Restaurant at the End of the Universe:
http://pages.cs.wisc.edu/~param/quotes/guide.html (I need to work on my HTML, I couldn't get the <a> tag to work for me...)