There is a book by John Gottman called 10 Lessons to Transform Your Marriage. It discusses situations that other couples have gone through (some dire) and tells how they get past it. It is written for people who are committed to the marriage so it is probably not applicable. I haven't read the other books suggested, but it is a little inspirational.
Together since Feb. 2003 Maried since July 2007 Bomb occured early Dec. 2008 She's approved for a lease mid Feb. 2009 (deciding on if to take it or not)