These are some of the most interesting (non-fiction) books that I have read.

The Millionaire Fastlane, MJ DeMarco, this is the #1 business book and the rest are in no particular order.
Failing Forward, John C. Maxwell
A Whole New Mind, Daniel H. Pink
The Debt-Deflation Theory of Great Depressions, Irving Fisher
The Toilet Paper Entrepreneur, Mike Michalowicz
Elliott Wave Principle, Frost and Prechter
Attacking Currency Trends, Greg Michalowski
Trading the Zone, Mark Douglas
Trading the Plan, Robert Deel
Made to Stick, Chip Heath & Dan Heath
The Culting of Brands, Douglas Atkin
Secrets of the Millionaire Mind, T. Harv Eker
The 80/20 Principle, Richard Koch
The Culture Code, Clotaire Rapaille