In response to the other review that got written on here, you are perfectly correct, it is outdated. The real question is, should that be a reason to give it one star? Maybe as a warning, but not as a review for the content of the book and its applicability at the time of writing. It was aimed at an older version of Rails, therefore it's applicable to that version of Rails. You shouldn't be comparing it to the latest version. If we did this in every review then many books would get a low rating. Technology changes, it doesn't mean you should give a book a bad review because it's outdated.
With all of this in mind, the book is aimed at complete beginners, those who haven't worked with Rails yet. In this respect, the book is good because it is basic. Personally, I'm a professional software developer, and I've worked with web MVC frameworks, and I had worked with RoR beforehand. This doesn't mean the book wasn't useful, because it covered topics which I had never had to deal with before, and certainly topics which I've found useful such as the mailing API, the use of AJAX.
I will point out there are a number of mistakes in this book, ones which shouldn't have been made. For example, there's quite a few grammatical inconsistencies, more than I've ever found in a book in fact. I wasn't keen on the description of AJAX either, whilst many believe it's still an acronym, truth be told it has outgrown its original design and many people argue that it is a word. I'd also argue the title of the book isn't appropriate "From Novice to Professional" isn't accurate, as this is more for complete beginners and bringing them up to a proficient level.
With all this said, I think this was Cloves' first book, it was written for an older version of RoR (which was current at the time of when the book was written), and it is aimed at complete beginners. I wouldn't recommend buying it now, but I would recommend buying the next version of their book Beginning Rails 3
that's released in September 2010.