I bought two books within a short space of time 'DW-CS4 Digital Classroom' pub:Wiley and 'DW-CS4 Classroom in a Book' pub:Adobe. I was halfway through DC before I switched to CB. Within the first couple of chapters of CB, I could see I was going to be able to knock up a web-site of my own in no time. The approach in this book made immediate (p5) use of DW's built-in CSS layouts(in Chapter 7 you get to design your own layout), which really empower page design from the start.
DC on the other hand concentrates so much on detail that you can't see the wood for the trees - in addition, DC gives only a brief mention (p46)of built-in layouts and chooses not to use them - end of the story.
The approach in CB is progressive, starting with a diy web-page and adding features and customization.
I would however recommend both books, CB first, then DC. If I was hard up, it would have to be 'Classroom in a Book'.