Look at the size of The Hitchhiker's Guide to the Galaxy! A victory for nerds everywhere.
I can't believe 100 Years of Solitude is so huge. I'm a fan of Love in the Time of Cholera, but 100 Years is so confusing, what with the multiple generations of people with the same name. Of course, I think I was 20 the last time I tried to read it, and I was kind of a dumbass at 20. (Who isn't?) I guess I could give it another go.