Willpower: Rediscovering the Greatest Human Strength by Roy Baumeister and John Tierney
260 pages (didn't read the Acknowledgments, the Notes or the Index)
Wow! I feel so much better now that I understand why I behave certain ways and that I'm not alone in those behaviors. Because of this book, I have a plan for improving my willpower and a plan for achieving some of the goals that have eluded me because of willpower issues.
It's a lot to plow through because the authors give lots of examples but it's worth it!