There are lots of things to recommend this book. It's short. It's Free! It's about HTML5 and publishing ebooks. I didn't think there would be anything that could go wrong. But in many ways, it's too short--not providing more than a taste of the HTML5 it offers, and it really is just HTML5 for people who already build ePub books. If you don't build ePub or you don't know HTML, then you may find this book a bit light.
Read my Full Review: HTML5 for Publishers Book Review