Pro Tools 101 is the first course in Pro Tools certification. This is the book that accompanies the course and introduces you to how it all works. If you have already done a 101 course, there is really nothing new apart from some of the newer features that can easily be learnt from the Avid website.
So is this book any good for the beginner... absolutely... It walks you through the initial setup, provides information on how to set up the interface and the hardware and get recording. The accompanying DVD has all the projects required to get you working and into the heart of Pro Tools. If you have bought an Eleven Rack or an Mbox interface, this book is fantastic to get you using the DAW quickly so you can get recording. If you have not upgraded to Pro Tools 10, the files on the DVD also cater for earlier versions (7-9)
With that said, some of us from the old school of recording will find it refreshing that in Pro Tools 10, the audio files are no longer called "regions", the are called "clips" (why that changed to the former, I will never know).
This book will obviously not make you a world renowned Pro Tools operator, but its a start. It covers all the usual, creating your first session, making recordings, handling midi, importing media and a host of other useful topics. It covers all the included plug ins and gives an overview on how to use them.
Learning how to use a DAW (Digital Audio Workstation) is not a simple subject because of the advanced features that are included and that they are capable of, you owe it to yourself to get at least one reference manual. This is it.
UPDATE 22nd February 2012:
If you want to do an Avid certification course then I would still buy the Pro Tools 101: An Introduction... as it tailored more for that. For beginners, I think this is also an easier book to get your head around.. But where this book falls short is that not all the concepts and tools are covered in detail, for example the "smart tool". That is covered in another course; Pro Tools 201. I guess that's why its called "An Introduction to Pro Tools 10"
I just received a copy of Frank D Cook's (same author) Pro Tools 10 Power!: The Comprehensive Guide and I must admit that if you need a reference manual for Pro Tools 10, then this is the must have book. Not the aforementioned title.