Niall Ferguson: The Ascent of Money: A Financial History of the World
A very readable history and analysis of the major financial marekts.
Hyman P. Minsky: Stabilizing an Unstable Economy
Minsky got it right. He was just 20 years ahead of his time.
Robert F. Bruner: The Panic of 1907: Lessons Learned from the Market's Perfect Storm
A brilliant case study of the 1907 crash and bank panic with lots of application to the Panic of 2007.
Tim Harford: The Undercover Economist: Exposing Why the Rich Are Rich, Why the Poor Are Poor--And Why You Can Never Buy a Decent Used Car!
An excellent common-sense guide to the value of economics in the real world.
Ted Fishman: China,Inc.
A comprehensive view of America's greatest trading partner...and rival.
Bryan A. Garner: Garner's Modern American Usage
Ideal & inexhaustable bathroom reading for anyone who loves language and aspires to write it well
Victor Niederhoffer: The Education of a Speculator
How to lose all your customers' money with style and grace
Fred Schwed: Where Are the Customers' Yachts? or A Good Hard Look at Wall Street (A Marketplace Book)
Published in 1940, it's still the best book ever written about Wall Street.