I'm a little wary of any book that talks about online learning tools, as I'd like to think that if the tools are any good, then I really should be using the tools themselves to learn. Having said that, I actually learn best from books (although that may well be down to the quality of the tools available) so the idea of a book that shows me how to get the best from Moodle was worth a read.
This book is a good introduction to the whole Moodle and E-Learning concept, and contains a lot of useful instruction and ideas as to how to get the best out of it. It provides good explanations of the main tools available to Moodle users, and identifies a number of problem areas that users are likely to struggle with, so will undoubtedly save readers a lot of time.
Where the book was less useful for me is that it focusses heavily on an academic environment, and is less easy to translate into how the tool could be used effectively in a corporate environment, which is my area of interest. I'm aware that the academic environemt is where Moodle is heavily used, but the book claims that it's written for "a teacher or a corporate trainer" and I found it less useful from a corporate perspective.
If you learn best away from a computer screen, or want a guide you can read in the bath (or anywhere else of course) then this will be a really useful book. If that's not you, then you'll find better resources online.