In the last month or so despite not having much spare time I spent a few hours reading an interesting book: Implementing Samba 4
It actually is more than a simple book, it is a well written step-by-step guide on how to install (on Debian 7, not that it makes much difference, the installation is really similar on CentOS for example), configure, manage and even migrate an existing Active Directory domain controller from Windows Server to GNU/Linux.
It consists of 9 chapters each one covering the most important features of Samba 4; everything explained in the book is also integrated with code snippets, scripts and command line examples.
I am sure this book will come real handy in case I will have to setup a GNU/Linux based AD domain controller.