Other

Barry Boehm , Software Engineering Economics, Prentice Hall, 1981; ISBN 0138221227.
The standard reference for thinking about how much software costs and why.

Stewart Brand , How Buildings Learn: What Happens After They Are Built, Penguin Books, 1995; ISBN 0140139966.
Even supposedly rigid structures undergo growth and change.

Malcolm Gladwell , The Tipping Point: How Little Things Can Make a Big Difference, Back Bay Books, 2002; ISBN 0316346624.
How ideas catch on.

Larry Gonick and Mark Wheelis , The Cartoon Guide to Genetics, HarperPerennial Library, 1991; ISBN 0062730991.
A demonstration of the power of drawings as a communication medium.

John Hull , Options, Futures, and Other Derivatives, Prentice Hall, 1997; ISBN 0132643677.
The standard reference on options pricing.

Nancy Margulies with Nusa Mall , Mapping Inner Space: Second Edition, Zephyr Press, 2002; ISBN 1569761388.
Ways to express your thoughts graphically. Enhances communication between linear and non-linear thinkers.

Taiichi Ohno , Toyota Production System: Beyond Large-Scale Production, Productivity Press, 1988; ISBN 0915299143.
Provides an interesting contrast with Principles of Scientific Management. Ohno's stirring manifesto of business accomplishment achieved with a philosophy of respect for all participants.

Edward Tufte , The Visual Display of Quantitative Information, Graphics Press, 1992; ISBN 096139210X.
More techniques for communicating numerical information through pictures. Good for understanding how best to present graphs of metrics, for example. Plus, the book is beautifully published.