Where are the Customer's Yachts? A Good Hard Look at Wall Street
by Fred Schwed, Jr.

An investment classic.

The Drunkard's Walk: How Randomness Rules our Lives
By Leonard Mlodinow

Why wine ratings, your children's grades, and mutual fund performance are more attributable to raw chance than anything else.

The Investor's Dilemma: How Mutual Funds are Betraying Your Trust and What to Do About it
By Louis Lowenstein

A stunning indictment of the mutual fund industry and an absolute must read for anyone that owns mutual funds.

The ETF Book
by Richard A. Ferri, CFA

A definative guide to all of the ins-and-outs of the ETF marketplace and successful ETF investing. Ferri also introduces the ground-breaking concept of "Index Strategy Boxes" to map out the true indexing strategy of ETFs.

The Wall Street Journal Complete Money & Investing Guide
by Dave Kansas

As its title suggests, this book is a primer, providing backgrounds on every major type of investment or financial activity, with a pleasing economy of style that incorporates sidebars for people seeking more in-depth information on how to read stock listings or the history of the Dow Jones Industrial Average.