I have been doing social media for local business since late 2007. This year I decided to write an ebook about starting and running such a business from my own experiences. It's called "Your Social Media Business".
But SocialMediaDIY is right- it is a quickly changing landscape, and any real lengthy tome on the subject will be outdated pretty fast. So my information is more like a guide, a 30 page DIY entrepreneurial manual for a bootstrapped social media business. It might not be what you are looking for, but I thought I'd throw it out there for your consideration.