The 7 Habits of Highly Effective People by Stephen R. Covey
Summary:
What a single guy can learn from this:
What a guy in a committed, monogamous relationship can learn from this:
Where to get it:
http://www.amazon.com/Habits-Highly-Effective-People/dp/0743269519/ref=sr_1_1?ie=UTF8&s=books&qid=1258433265&sr=1-1