Krafft begins with an introduction to Debian, its history, and the philosophy of Free Software to bootstrap the reader into the matter. Introductory topics such as Debian's installation and the organization of the project are also covered, and offer the reader a comprehensive picture of Debian.
Subsequently, things become more complex. He describes Debian package management in all its glory, the interaction between dpkg and the frontends (apt, aptitude, synaptic, etc.), and peculiarities of the system, such as Debian package version numbering. A large number of the tools that make an administrator's day-to-day life easier are presented and explained in detail. The book is especially suited for administrators, as it identifies typical problems with the distribution and offers solutions to counter them.
Topics of primary relevance to developers, such as packaging, are also extensively covered. It struck me positively that the author also examines newer alternative build tools, such as yada and cdbs, and describes manual packaging (package creation without the use of debhelper). This is one of the reasons why this book is of particular interest to prospective developers and people who have to build their own packages for whatever reason. New maintainers can draw from the book a good overview of the knowledge required to become a Debian developer.
Krafft manages to illustrate topics such as APT pinning, which have a reputation of being complicated and daunting, in an accessible way. For inexperienced Debian users, this book will also be a pleasant read. It is not, however, a topical user-oriented book.
Instead, the book targets administrators, developers, and those that work with Debian on a regular basis. Nevertheless, even long-time users will most certainly find new and interesting stuff between the covers. Whoever considers the information on the Debian Web site to be too dry will find in this book an enticing alternative.
In my opinion, this book has the potential to become the future Debian Bible. It is nice to see that Martin F. Krafft regularly publishes additional information and errata on the book's Web site, http://debiansystem.info/.