For example, the E-Myth: "Think of your business as a franchise prototype: work on it, not in it." I just saved you ten dollars and five hours not to mention a painful-to-read chapter about the author's mess of a life pre-profound insight.
Forget all the business and self-help books and just go read Michael Lewis's Liar's Poker and Founders at Work. (Read Getting Real though, because that book will knock some product design sense into you.)