Making sense out of MVC in Flex

Now that the video project is nearly out of the way, I'm anxious to get back more to Flex and to do this MVC is a top priority. Looking around the web there are a lot of tutorials but most focus on using frameworks like Cairngorm and PureMVC and very light info on the concepts of MVC and how they are implemented in AS3. Fortunately I stumbled upon this one--from the writers of an OReilly book on the subject -- and it's so good I'm thinking about buying the book:

http://www.as3dp.com/category/design-patterns/mvc/