Not necessarily "post-apocalyptic", but definitely "speculative" is this top of 2007 list by Pat's Fantasy:
1- Black Man/Thirteen by Richard Morgan (Del Rey/Gollancz)
2- Reaper's Gale by Steven Erikson (Tor Books/Bantam Press)
3- Ink by Hal Duncan (Del Rey/Pan MacMillan)
4- Brasyl by Ian McDonald (Pyr/Gollancz)
5- Ysabel by Guy Gavriel Kay (Penguin Books/Simon & Schuster)
6- The Terror by Dan Simmons (Little, Brown and co./Bantam Press)
7- Dreamsongs, Volume 1 by George R. R. Martin (Bantam Dell/Gollancz)
8- Red Seas under Red Skies by Scott Lynch (Bantam Dell/Gollancz)
9- Fatal Revenant by Stephen R. Donaldson (Putnam/Gollancz)
10- Empire of Ivory by Naomi Novik (Del Rey/Voyager)
http://fantasyhotlist.blogspot.com/2...on-titles.html