"Good is the Enemy of Great"

I was just having a drink with an old friend in Belltown near my place and pleasantly met someone in upper management at MS that also happened to be a passionate entrepreneur. He swore up and down to me that "Good to Great" by Jim Collins is a "must-read" for entrepreneurs and corporate executives. So I am giving it a try. So-far, I haven't been disappointed but I will judge it only when I have finished it.