If you know Rails and Flex, and if you are <em>desperately</em> looking for a book that can guide you to Integrate Flex and Rails, then this is the book to buy.
I was actually waiting to read the book Enterprise Flexible Rails, but as you can see, the book will not be published.
*Firstly, I would like to appreciate the authors for the sample code published in GitHub. They are ready to serve and very well organized.
*It has a right combination of addressing Flex and Rails. This book can sure help you to build enterprise level Flex based application with Rails backend.
*Got lots of tips, collections and receipes that you may not find easily in Internet
*Chapter 8 is very useful in getting an overview of Cairngorm and PureMVC, and the sample codes were also driven with it.
*Has a detailed Chapter on Testing using Fluint, something that is important for developers who loves TDD/Agile
*One thing I very much liked the quality of the sample codes, it address common use-case, well structured. Best of all, the authors updates the code at their blog [...]
*While the first part of the book gives conceptual details & foundations, the second part of the book gives useful recipes. Especially Authenticating, server push with Juggernaut, File Upload and so on.
*Finally, its worth buying.