I'm going to keep track here. So far, at some point in my life I have read the following Pulitzer Prize winners:

"Novel"

*1947 All the King's Men by Robert Penn Warren
1945 A Bell for Adano by John Hersey
*1940 The Grapes of Wrath by John Steinbeck
1939 The Yearling by Marjorie Kinnan Rawlings
*1937 Gone With the Wind by Margaret Mitchell
1932 The Good Earth by Pearl S. Buck
1928 The Bridge of San Luis Rey by Thornton Wilder
1926 Arrowsmith by Sinclair Lewis
1925 So Big by Edna Ferber
1921 The Age of Innocence by Edith Wharton

"Fiction"
* 1953: The Old Man and the Sea by Ernest Hemingway
1956: Andersonville by MacKinlay Kantor
1960: Advise and Consent by Allen Drury
* 1961: To Kill a Mockingbird by Harper Lee
* 1963: The Reivers by William Faulkner
1967: The Fixer by Bernard Malamud
1968: The Confessions of Nat Turner by William Styron
1973: The Optimist's Daughter by Eudora Welty
1975: The Killer Angels by Michael Shaara
1979: The Stories of John Cheever by John Cheever
1980: The Executioner's Song by Norman Mailer
1983: The Color Purple by Alice Walker
1984: Ironweed by William Kennedy
* 1986: Lonesome Dove by Larry McMurtry
1988: Beloved by Toni Morrison
1989: Breathing Lessons by Anne Tyler
1992: A Thousand Acres by Jane Smiley
1994: The Shipping News by E. Annie Proulx
1999: The Hours by Michael Cunningham
2002: Empire Falls by Richard Russo
2003: Middlesex by Jeffrey Eugenides
2004: The Known World by Edward P. Jones
2009: Olive Kitteridge by Elizabeth Strout

So, that's only 33. Those I have *'d I have read more than once.
Edited to add touchstones.
11-09 Edited to add this year's winner, which I loved.

List of the History Prize Winners of which I've read exactly none.

The Biography/Autobiography prize list.

From that bunch, I have read these:

Truman by David McCullough
John Adams by David McCullough
Angela's Ashes by Frank McCourt
parts of God, a Biography by Jack Miles
Growing Up by Russell Baker
Eleanor and Franklin by Joseph P. Lash
Huey Long by Harry Williams
Mr. Clemens and Mark Twain by Justin Kaplan
Profiles in Courage by John F. Kennedy

The general non-fiction category Only a couple of these have even come to my attention, and I have read just these:

The Dragons of Eden Carl Sagan
Pilgrim at Tinker Creek Annie Dillard
The Making of the President 1960 Theodore White

Message edited by its author, Nov 24, 2009, 11:17am.

welcome to the challenge! You are off to a great start. 32 read out of 82 total. wow :)

Looks like a very respectable number read. You'll laugh if you see the number I've read :-)
Are there any of these that you would highly recommend? I know that's a hard ask, as they are probably all very good.
I have Beloved, Middlesex, The Age of Innocence and The Grapes of Wrath so far on my virtual wishlist.

Beloved and Middlesex both get very high marks from me.