Just about everything you'd ever want to know about web design and Photoshop CS3. The book teaches you some great things I haven't seen in any other books I've looked at. It starts off very basic (layer work) and gets into advanced subjects such as scripts. It also covers some of the more odd features for web design, that you've probably never heard of. For instance, did you know Photoshop can makes copies of files in a folder with any extension and resize them with a max width and height? Or did you know you can import files between the the various CS3 programs? Or how to go about creating .gif animations with Photoshop? This and other really cool features are all in this book.
My only complaint is the books encouragement to use Dreamweaver. Dreamweaver is a great program, but it generates terrible code and most of its templates generated from Photoshop rely on tables. Not good and way behind web standards. My suggestion is to thoroughly learn Photoshop and integrate what you know with a good knowledge of CSS and XHTML. Avoid Dreamweaver, it brutally butchers code behind your documents to the point where it's not acceptable as far as web standards go. Although Dreamweaver seems like a great way to jump corners on learning web design, don't. You'll find that the program will vastly limit your capabilities as a web designer as time goes on.