Check out Modern Library's list of the top 100 novels of all time.
What really made me laugh was the difference between the Board's List and the Readers' List. The latter was voted on by readers of the site. Modern Library is a "classics" division at Random House; I don't hold it against them too firmly that they put two James Joyce books in the top five--they're going for Quality and Gravitas.
But the readers of this site were apparently heavily into Modern Crackpot Philosophy, because the top 10 of that list contains seven books by either L. Ron Hubbard or Ayn Rand.
The Radcliffe list is pretty good, though, and I suddenly have a powerful urge to read Henry James' The Wings of the Dove.