Although there is alot to like about this book, there is a fatal flaw that needs to be considered by anybody thinking about buying it. Apparently the author wrote and tested the book entirely on a Mac, and it appears that the css was never tested under IE6/7 on Windows. Many variations of a single page are used throughout the book and unfortunately 1 small piece of the css used for the masthead and navigation menu simply does NOT work in IE6/7. The problem is some kind of a quirk in Internet Explorer because the css works correctly in Firefox and presumably on a Mac. Because the same page is used in several chapters the problem also ripples through several chapters. The problem is manifested whenever you try to match what you were instructed to do against the screen shot and what happens is that the navigational menu disapears - so your screen frequently doesn't look like the snapshot in the book. I have submitted the problem to the publisher but because it affects so many parts of the book, the fix may take some time.
So if you are running Windows and are willing to work through the book using only Firefox then carry on because I think the material is worth it. And maybe the real value to the book is to challenge you and develop your skills such that you can figure out the workaround. But if you want it all clean and spelled out for you can only be patient.
Later... after the first pass at the review. I can't seem to change the 2 stars to 4 stars which I would if I could. I found the answer to the Fatal Flaw. To give credit where credit is due, the pointer to the answer comes from "CSS The Missing Manual" by David Sawyer McFarland.
In several internal as well as external stylesheets and in multiple chapters, you are either instructed to enter "#masthead {background: #ABD240;}" - not including the quotes, or it is already in the style sheet. What you need to enter is "#masthead {background: #ABD240; line-height: 1.1;}" or change the already existing entry - again not including the quotes. This doesn't change anything else on the screen but apparently fixes this IE6/7 idiosyncracy. With all this said, I recommend that you get this book.