The number one book in the category of Business and Investing is Outliers: The Story of Success by Malcolm Gladwell. I am just starting to read this book now. I had previously read and reviewed one of Gladwell's previous books, Blink.
The number one book in the category of Investing is Crash Proof: How to Profit From the Coming Economic Collapse (Lynn Sonberg Books) by John Downes.
The number one book in Stocks is The Myth of the Rational Market: A History of Risk, Reward, and Delusion on Wall Street by Justin Fox. It will be available on June 18, 2009.
The number one book in Stocks available now is How to Make Money in Stocks: A Winning System in Good Times and Bad, Fourth Edition by William O'Neil.
The number one book in Real Estate is The Real Book of Real Estate: Real Experts. Real Stories. Real Life. by Robert T. Kiyosaki.