Here are my top three picks for various genres (there were a couple ties

) These aren't
all necessarily my favorites, but they are the ones I think will survive a hundred years from now (and most are favorites).
Literature
__1. Ernest Hemingway
__2. John Steinbeck
__3. (tie) William Faulkner
__3. (tie) Virginia Woolf
Playwright
__1. Tennessee Williams
__2. Samuel Beckett
__3. Arthur Miller
Horror
__1. Stephen King
__2. H.P. Lovecraft
__3. Anne Rice
Action/Adventure
__1. Jack London
__2. Ian Fleming
__3. (tie) John Grisham
__3. (tie) Tom Clancy
Mystery
__1. Agatha Christie
__2. Sir Arthur Conan Doyle
__3. (tie) Dashiell Hammett
__3. (tie) Raymond Chandler
Science Fiction
__1. Isaac Asimov
__2. Robert A. Heinlein
__3. (tie) Arthur C. Clarke
__3. (tie) Philip K. Dick
__3. (tie) Neal Stephenson
Fantasy
__1. J.R.R. Tolkien
__2. J.K. Rowling
__3. Edgar Rice Burroughs
Western
__1. Zane Gray
__2. Louis L'Amour
__3. Elmore Leonard
Poet
__1. Robert Frost
__2. T.S. Eliot
__3. (tie) e.e. cummings
__3. (tie) Maya Angelou