Levitt, T. The Marketing Imagination . New York: Free Press, 1986.
Arguably the most influential book on modern marketing that has ever been written. Levitt is the inventor of the whole product concept and the first person to focus marketing towards creating customer value.
Moore, G. A. Crossing the Chasm: Marketing and Selling High-Tech Products to Mainstream Customers . New York: Harper Business, 1999.
This book spawned an entire new lexicon in product management. Forget to read this book and you can forget about advancing your career beyond some distressingly boring dead-end assignment.
Cooper, R. G. Winning at New Products: Accelerating the Process from Idea to Launch . Cambridge, MA: Perseus Books, 2001.
Robert Cooper has written several books about how to create truly useful products. His approach combines common sense, market understanding, and flexibility with rigor and discipline.
Davidow, W. H. Marketing High Technology: An Insider's View . New York: Free Press, 1986.
A classic and timeless book from a true veteran of silicon valley. What I like best about the book is Davidow's candid approach. According to Davidow, marketing is civilized warfare led by crusaders, not evangalists. Unless you play for keeps don't play at all.
Ries, L. and R. Ries. The 22 Immutable Laws of Branding: How to Build a Product or Service into a World-Class Brand . San Francisco: HarperCollins, 1998.
This little book has a wealth of good advice on how to manage brands. If you want to know a lot about how marketing folks approach brand management, this is the book to read.