As you may know, I have been working with JoomlaShack for close to a year now. Before I started working with JoomlaShack, I knew about Barrie North from CompassDesigns.net and JoomlaShack. I knew about him because he has provided loads of free tutorials for the Joomla! community on his website. I learned much of what I know about template development from his Joomla! template tutorial.
Barrie is selling his 100+ page e-book, The Joomla! Admin Manual, at his website for $27. If you're like me, and you know the high quality of the tutorials produced by Barrie, then you know that $27 for a 100+ page e-book written by Barrie is a real bargain. I strongly encourage you to take a look at his site and decide whether or not this book is for you.