Hi Craig, I've read both Freakonomics and Superfreakonomics - both good reads. I'd tend to agree with you that the 2nd one is a little better.
For another interesting read, an older book is "Guns, Germs, and Steel: The Fates of Human Societies" by Jared Diamond. It looks at reasons why western European culture succeeded better than cultures from other parts of the globe. I read it shortly after it was published and haven't touched it for awile. It may be time to read it again.
I've also got one of Peter Drucker's later books sitting by the bed for re-reading - he definitely had an insight into business.