My favorite is the oft-overlooked "WOlf and Iron" by Dickson but there are many thousands of Survival / Holocaust / Nuclear War / Natural Disaster books out there. There is probably a book or two that anyone would like.
Here are a few websites I find interesting when looking for a good read :
http://www.sfandf.com/html/scifi-fantasy-books.html?id=4&p1=2015&p2=books&p3=sfhttp://www.wsu.edu:8080/~brians/nuclear/a.htm
http://www.ibdof.com/IBDOF-genre-booklist.php?genre_id=38http://www.scifan.com/themes/themes.asp?TH_themeid=9&Items=http://www.scifan.com/themes/themes.asp?TH_themeid=72&Items=These are just a couple of sites I use to update my own book database.
Hopefully someone will find a book here that interests them enough to track it down and read it.
- TheDarkOne