Zeldman's DWwS is a can't put down book for many
Today in my short drive to the Metro (about a mile) I saw two folks walking with Jeffery Zeldman's Designing With Web Standard in hand. One of these folks was walking and reading it. I wanted to reach into my backseat and get my copy to hold up and honk (not a good safety move so I held back by show of oneness).
I personally think this book rocks. This book helps prove I am sane as there are many discussions at work that this book will easily help support the decisions we made to incorporate standards-based Web development. We do not have a user base that permits the use of full XHTML and CSS2, like this site, but it has made maintenance of pages (45,000 to 55,000 pages in all with 8,000 or more done while moving to standards based validation or actually validating).
Jeffery does a wonderful job writing about the whys and hows of Standards based development and design. He also make understanding the benefits very easy to grasp.
This may be the one starter book for Web developers to help them sell Standards-based development or to learn why they should be embracing it and moving forward with learning and using it.