On Facebook, one challenge is to list 5 books that have affected you. It has been an interesting set of lists.
God Winks by SQuire Rushnell
Linchpin by Seth Godin
Tribes by Seth Godin
5 Pieces of the Life Puzzle by Jim Rohn (and the Art of Exceptional Living CD)
Endless Referrals by Bob Burg
The Sales Bible by Jeffrey Gitomer
Think and Grow Rich by Napoleon Hill
I read a lot of mysteries from Robert Parker (Spencer); Robert Crais; Eric Van Lustbader; David Morrell; Ed McBain; Jack Higgins; Barry Eisler; Michael Connelly; Vince Flynn; and Lawrence Block.