I just finished Try It & See by Megan Auman, and I thought it was a refreshing small business read. Rather than being a systems book (like GTD, which I also love), the book is much more about mindset.
She talks about shipping things out into the world (even/especially when you aren't ready), pricing, experimenting, and remembering to have fun in the business you built for yourself. That last one really resonated with me.
It was a quick, eye-opening read from an author with real experience running a small jewelry business. I think this book will be just as useful to reread in 6-12 months, after implementing and experimenting with some of her ideas.