I just found this list of the top ten apocalyptic novels. Definitely worth checking out.
Here’s the list itself:
1- World War Z by Max Brooks
2- Blindness by José Saramago
3- The Road by Cormac McCarthy
4- The Postman by David Brin
5- Oryx and Crake by Margaret Atwood
6- A Canticle for Leibowitz by Walter M. Miller, Jr.
7- Alas, Babylon by Pat Frank
8- Lucifer’s Hammer by Larry Niven and Jerry Pournelle
9- Swan Song by Robert R. McCammon
10- On the Beach by Nevil Shute