This book covers the P3P Project (the Platform for Privacy Preferences), from its inception and development through to a discussion of the current state of the proposal. Further chapters also provide an overview of related protocols and tools, such as APPEL. The author of the book is one of the co-authors of the specification and so has a good understanding of the issues involved in creating the standard.
The book is arranged in three parts: background and history, enabling a web site, and software and tools. At the end are appendices covering some odds and ends.
The question is: do people really care about their privacy online? Probably not as much as they should do. P3P is an attempt to make protecting our privacy as transparent as possible. We should be able to specify what information about ourselves we want to make available to a web site or organisation and then let the software take care of it for us. There are many places that software can be P3P enabled, browsers being an obvious example, but also web proxies, installation programs, registration programs and so on. Unfortunately there seems to be very little available in the real world.
When reviewing the book I had expected to find more on the code side, and was a bit disappointed to realise that the book covers only the protocol, albeit with a large chunk of XML. As far as discussing the P3P protocol goes, the book is excellent reading, if occasionally rather dry. The author clearly knows the technology and explains it clearly. Whether any of it matters is another thing entirely, but if you are in the business of P3P enabling your company's web site, then this book is recommended.