What are the best books you've read that help you in your work, but aren't necessarily 'business' books? I'm reading Imperium by Robert Harris, a historical novel about the life of Ancient Roman statesman, Cicero, and it's an incredible insight into communication, strategy and creativity. What would you recommend?

Hey friends did you ever want to launch but didn't do because you were not happy with your product yet? We are at this point right now. We are afraid that a buggy product will scare new users away. I am seeking now for YOUR help. What do would you recommend?