The Active Directory Cookbook, 4th Edition is a handy reference book to have if you manage any part of Active Directory.  The latest edition by authors Brian Svidergol and Robbie Allen, has been updated to include recipes for Windows 2012 and Windows 8.

The book is written in a style that makes it easy to find solutions for actions performed in Active Directory.  The format of problem-solution-discussion provides a way to quickly find what you need, perform the action and move on to the next thing.

There are always many ways to accomplish things in a Microsoft environment. This book recognizes that and provides multiple ways of getting things done  Prefer the GUI?  Prefer PowerShell?  The cookbook has you covered.

I found this book very helpful when implementing AD FS and AD LDS–two fairly uncommon segments of Active Directory.

I would definitely recommend having this book in your arsenal.