I just finished Game of Thrones over the weekend and really enjoyed it, but felt I needed a bit of a break before continuing on through the series. I started One Second After on Sunday and am almost done with it. I'm really enjoying it, I appreciate the looking back to history for answers to current problems. My biggest gripe about the book is that basically everything that can go wrong does go wrong. It makes it a little less believable, but it does add excitement, so not the worst thing in the world.
Worth picking up if you enjoy post apocalyptic stories.