I subscribe to O'Reilly's Safari service, and I just added "Producing Open Source Software" by Karl Fogel to my bookshelf. It actually looks REALLY good. I've perused a few chapters and am confident that by reading it I'll increase my chances of making PBooks a successful open source bookkeeping project.
I can't believe this book is only $17! Even with the little bit I read online, I'm really impressed with it. I'll likely buy a copy after I read it online so that I have a copy on hand.