The Debian Administrator's Handbook is now available in several formats and from several sources -- all linked from the website at http://debian-handbook.info/ This translation into English of the fifth edition of the French “Cahier de l'Admin Debian” (published by Eyrolles) has been crowdfunded, and the results are just released. The funding campaign was so successful that the book is even published under not one but two free licenses (GPL-2+ and CC-BY-SA-3). It is available as paperback, in several electronic formats for easy consumption, and even browsable online from the website. And of course, it's also been made available to Debian users in the "debian-handbook" package.