I read "One Second After" sometime last year and really enjoyed it.
If you liked that one, I think you would really like "Patriots" by James Rawles. It's pretty much a doomsday book, about the economy crash. There's been a group of survivalist in northern Idaho, preparingfor it for years, and when crap hits the fan, the guys are ready. It's a VERY good read. What I really like about it, you can easily see it happening tomorrow.
Also, Critical Mass was very good, if you like end of the world type stuff.