You would never guess that this book was written by so many different people just from reading it because the information contained in the book is well written, considstent, and logically ordered, something that many books with multiple authors lack.
The sub-title on the cover refers to big sites as the targetted audience for this book. I disagree with that sub-title as the content of the book is as appropriate for smaller web sites as it is for the larger ones.
Not being satisfied with telling you how to code to the standards, the book then concludes with two real life case studies of real web sites that underwent makeovers to bring their code in line with the standards. These case studies are particularly interesting because they cover when a larger site may need to consider breaking certain of the standards in order for their pages to handle the heavy load that their huge number of visitors represent. Conciously deciding to break standards and having a specific reason for doing so is a very different situation to inadvertantly breaking standards through failing to code properly in the first place and these case studies make it clear what that difference is.
Another excellent practical book from New Riders