A very short book; I think it took me an hour or so to read all the way through. BUT...it brings together all the threads of the Responsive Web Design concept in a clear and useful way. (He's self-deprecating about it, but the math for calculating a flexible grid's proportions based on a pixel grid is easy and just what I needed.) I ended the book fired up to do design this way from now on, and to go back and update sites I already have out there. Great color screenshots, easy-to-read code. And I like the quirky friendly voice.

A notable thing, from my POV as someone who's been making websites for well over a decade (!), is his references in the acknowledgements to "A Dao of Web Design" - that article marked a critical moment in my growth as a web designer. It was written back when IE5 was the new hotness, IIRC, but it's the same philosophy undergirding this book, and that's a damn good thing.