Whatever You Think, Think the Opposite by Paul Arden One of my favorite books!
It's Not How Good You Are, It's How Good You Want To Be by Paul Arden Great little book!
Free: How today's smartest businesses profit by giving something for nothing by Chris Anderson
The Long Tail: Why the Future of Business Is Selling Less of More by Chris Anderson A must for anyone wanting to make it in eCommerce
Drive: The Surprising Truth About What Motivates Us by Daniel H. Pink Great book about motivation. You'll learn what really works when it comes to motivating people and teams
Blink by Malcom Gladwell
The Tipping Point by Malcom Gladwell
Permission Marketing by Seth Godin Still a classic
Purple Cow by Seth Godin