How to Stop Worrying and Start Living - http://www.amazon.com/How-Stop-Worrying-Start-Living/dp/0671...
How to Win Friends & Influence People - http://www.amazon.com/How-Win-Friends-Influence-People/dp/06...
Mind Hacks: Tips and Tricks for Using Your Brain - http://www.amazon.co.uk/Mind-Hacks-Tricks-Using-Brain/dp/059...
Mind Performance Hacks: Tips & Tools for Overclocking Your Brain - http://www.amazon.co.uk/Mind-Performance-Hacks-Tools-Overclo...
A Philosopher's Notes: On Optimal Living, Creating an Authentically Awesome Life and Other Such Goodness, Vol. 1
http://www.amazon.com/Philosophers-Notes-Creating-Authentica...
This is the best Personal Development Book I ever read.
Meditations by Marcus Aurelius http://www.gutenberg.org/ebooks/2680 He wasn't the CEO of a Fortune 500 company, but he was Emperor of Rome. ;)
Walden http://www.gutenberg.org/ebooks/205
Most of the big problems in life have already been pondered eons ago.
The Power of TED (The Empowerment Dynamic) by David Emerald
Loving What Is: Four Questions That Can Change Your Life by Byron Katie
Get Out of Your Own Way: Overcoming Self-Defeating Behavior by Mark Goulston and Philip Goldberg
Feeling Good: The New Mood Therapy by David Burns
Mojo: How to Get It, How to Keep It, How to Get It Back if you Lose It by Marshall Goldsmith
The New Manual 2.0 by Tripp Lanier thenewmanual.com
The Seven Habits of Highly Effective People http://en.wikipedia.org/wiki/The_Seven_Habits_of_Highly_Effe...
Starting Strength http://startingstrength.com/
(controversial :-P) The Paleo solution http://www.amazon.com/Paleo-Solution-Original-Human-Diet/dp/...
It uses the short stories from the work days of a senior manager and software consultancy owner to explain how and why the brain reacts the way it does in challenging situations and gives advice on how best to mitigate its limitations.