World War Z - Max Brooks -- good book
Blindness - Jose Saramago -- haven't read
The Road - Cormac McCarthy -- love it or hate it book, i enjoyed it
The Postman - David Brin -- good book
Oryx and Crake - Margaret Atwood -- excellent book, definately top 10
A Canticle for Leibowitz - Walter M. Miller -- pretty boring and a bit meta for my tastes
Alas, Babylon - Pat Frank -- good book
Lucifer's Hammer - Larry Niven & Jerry Pournelle - have not read yet
Swan Song - Robert R. McCammon -- this book was long and engaging, but in a fluffy way. not quality work.
On the Beach - Nevil Schute -- have not read
if you are interested in finding a good reading list for post-apocalypse books, check out this goodreads.com group:
Goodreads.com Apocalypse Whenever
Some that didn't make this list that I would recommend:
Into the Forest by Jean Hegland
Windup Girl by Paolo Bacigalupi
Eternity Road by Jack McDevitt (probably my favorite PA book)
The Seventh Day by Hans Hellmut Kirst
Day of the Triffids by Jack Wyndham
Survivalist by Jerry Ahern (books 1-5 were really entertaining in a fluffy way. STOP THERE! DO NOT READ THE REST OF THE BOOKS!)