Here's a great interview with Roger Martin, Dean of Rotman.
He provides a very crisp definition of what design thinking is about. Design thinking is about creating better things, while traditional analytic thinking is about choosing between things. We need both, but surely the world would be in a better place if there was a bit more design thinking in play out there. Which is why we now have places like Rotman and the d.school and the entire design thinking movement.
By the way, if you don't read Rotman magazine, you should. And if you haven't read Martin's book The Opposable Mind, go out an grab a copy today!