As far as books about building green with the help of a fancy architect go, this one wasn't bad. At least the author comes at the topic admitting that an architect, builder, and project manager aren't strictly necessary for building with natural materials. A lot of the ideas are applicable whether or not you're building a several-thousand square foot retreat on the top of a mountain. The pages discussing "What to discuss with your architect before you begin" or "How to make sure workers get stuff done on time", etc., are still important for a DIY-er, because if you don't have an architect and crew of craftsmen on your payroll, you're going to have to do all those same things by yourself.
The different homes that were featured offered up lots of new design concepts that started some wheels spinning in my mind, and the layout of the book was gorgeous. I'd say this definitely falls more into the realm of house porn than how-to. Coming at it from that direction, it was an enjoyable read and a decent overview. This book also addressed the landscaping of the different sites, which is (I'd say) an important part of making a place habitable, but which other natural building books don't really cover.
My big complaint is that, while three (or more?) of the houses were built using some form of straw bale, the author never touches earthbag or rammed earth (etc.). He barely mentions cob as a substance with which to decorate a fireplace mantel.