"Choosing to Cheat; Who Wins when Family and Work Collide," by Andy Stanley. This is a short 90 minute read about prioritizing our time where it's most important...I think it's esp. good for those of us that haven't make photography our sole job and are juggling too many things at once!
"Good to Great," by Jim Collins. You've probably heard dozens of people recommend it, but you should seriously read it for youself. Not only will it help you in your business, but it will teach you about what it means to be a trul great leader.
"The Encyclopedia of Healing Foods," my nerd book. I love reading about the natural source of vitamins, medicine and other good stuff that God gave us in good food. I also love trying to get myself and others to quit eating crap.
That's just a few for now. I'd love to hear if read any of these and find them helpful!