7 Habits of Highly Effective People - Stephen R. Covey
The Speed of Trust - Stephen M. R. Covey
How to Win Friends & Influence People - Dale Carnegie (Great AoM book, written in 1936)
Getting Things Done - David Allen
I'm reading I will teach you to be rich by Ramit Sethi right now. Extremely good book. He has a blog with the same name. Don't let the campy title fool you. Solid, action-focused advice with no navel-gazing. In a similar vein, The four-hour work week by Tim Ferriss changed my life for the better. The basic message is automating your income to free your time for what is truly important (along with helping you define what is important to you). I'm not all the way there, but I'm working towards it.
The Alchemist by Paulo Coelho is fiction, but the emphasis is similar. The story follows a young boy trying to meet his Personal Legend. According to the book, a Personal Legend is "[...] what you have always wanted to accomplish. Everyone, when they are young, knows what their Personal Legend is." He meets people who gave up on their legends, who accomplish theirs, and the obstacles he meets. Very powerful book, and world record holder for most translated book by a living author.