Ray,
Thanks for your interest.
Chapter 2 is not yet published. It will be a very basic guide entitled "(Why) Should I get a flash unit for my camera?" It's intended to explain the advantages of a hotshoe flash unit verses the built-in flash. The question comes up here once in a while, so I thought it would be good to have as a reference.
The text is written and I'm trying to find a nice-looking model to sit for some example shots to demonstrate the differences. If you already have a flash unit, there probably won't be much info in it that's news to you.
Other subsequent chapters will probably deal with high-speed sync, guide numbers and flash brackets.