Ronald Heifitz: Leadership Without Easy Answers
Excellent book on leading organizations through adaptive challenges
Ronald Heifitz: Leadership on the Line
Follow up to "Without Easy Answers" but with a stronger focus on the personal issues that impact our ability to exercise leadership.
Bagley and Dauchy: The Entrepreneur's Guide to Business Law
Terrific reference. Not as dull as it sounds.
Rogers: The Entrepreneur's Guide to Finance and Business
Best book of its type. Extremely practical.
Nassim Taleb: Fooled by Randomness
Unless your name is Richard Zeckhauser, this book will change the way you view the world.