At some point, I think every web jockey has scoped out the CSS Zen Garden for a little inspiration (I dig this one). It’s a great example of the power that comes from the separation of style from content, and the proper use of semantic markup.
Hopefully, the book will include some hand-picked designs, along with commentary on the techniques used in CSS. That would be a great resource. The pretty layouts are only part of the appeal of the Zen Garden. The other part, the sell-me-a-book-of-this part, is the ability to crack open the markup and the stylesheets and see how it’s done.