I have just finished reading carefully the book written by Martin F. Krafft simply called “The Debian System, Concepts and Techniques” (Open Source Press / No Starch Press – Sept. 2005). I must say it is the first book about Debian I have ever read that I really enjoyed reading: really easy to read and understand, quite complete, never boring, numerous concrete examples, and I have found some chapters are quite unique in this kind of book (eg. I have particularly appreciated the part that deals with symlinks farm for Linux kernel building).

Everyone can read this book, beginners on Debian (maybe not beginners on GNU/Linux) as well as experienced users, and it proves to be useful to both!

Other reviews are available here and here (just examples, more can be found!).