Some of the reviewers seem to be wishing for a "..for Dummies" book. This aint it. What this book is is an excellent overview of the entire Amazon e-commerce platform from the perspective of a web developer. It is written by a web developer for web developers, full stop. And as far as that statement is true, this is an excellent (and inexpensive 8-) resource.
That said, there is most certainly an opportunity for some author out there to write a down and dirty guide to Amazon e-commerce for folks with mom'n'pop websites. Indeed, how about a down'n'dirty guide to amazon/ebay/google/yahoo services..as well as RSS..you name it? A gaping hole in the market IMHO.
Well, I digress: the current book is excellent and heartily recommended to developers and tech-savvy website managers who don't mind skipping some gory details to read a very good overview of what Amazon has on offer.