First, Break All the Rules: What the World's Greatest Managers Do Differently - M. Buckingham and C. Cuffman (1999)

This book needs no introduction. This has been cited as one of the top 10 books in the management literature.

http://management.about.com/od/careerdevelopment/tp/TopMgtBooks.htm

Rather than writing a commentary on this book, I will suggest people to go through the reviews on Amazon. If you have not read this book, I will suggest you read it as soon as possible.