Given the vast swamp of business literature out there, it is hard to tell the signal from the noise (and it is definitely mostly noise).
The problem is that there are many that are good books by smart guys with good ideas - just that the ideas are really something that could be summed up in a few pages.
I would second the recommendation for 'Growing a Business' and 'Founders at Work', which is impossible to really summarize because it's full of interviews.
The Toilet Paper Entrepreneur (Mike Michalowicz) -- solid, practical advice. Goes beyond the usual business-book cliches.
Guy Kawasaki's "The Art of the Start" was okay, but it was too superficial / trite for my taste.
"Rich Dad Poor Dad" by Robert Kiyosaki. Yeah, really. Both this book and the author have been the recipient of a good amount of criticism, but this book help me a lot to increase my thinking beyond a 9-5 job as the primary way of making money. That said, the book is more inspirational and vague than a concrete plan on how to do anything in particular.
"Classic Drucker", edited works of Peter Drucker
http://www.amazon.com/Growing-Business-Paul-Hawken/dp/067167...