Best Business Book Ever Written
I just reread this book, which I tend to do every year of so and was again amazed at Drucker's insight into business and human nature.
This new edition covers sixty years of Drucker's writings from twenty-six different books. No one has impacted modern business more than he.
If you have not read Drucker before, this is a great introduction. If you have read him, then this condenses all of his key concepts into a single volume.
Highly recommended.