The full color screen-shots and in-depth analysis make this a fine book. The best parts are the side-bars that summarize the key takeaway points of each section. I also like the pattern-language - "overlay" - it could mean a few different things depending on who you ask, but in this context it is described as a specific concept and differentiated from "inlay" for example. I like that this book actually gets quite technical, yet does not include any real source code or steer you towards any particular technology/framework/language. We need more books like this - teach us about the "why" but leave the "how" up to us.
