I came across this article browsing for PureMvc info the other day on Active Tuts Plus. It is an excellent walk through of the PureMVC implementation for AS3. It takes you from soup to nuts to build a working Flikr feed gallery. Anyone who is looking at FoxR but is light on Pure MVC knowledge or experience should check that out.
Understanding the PureMVC Open Source Framework
And if you happen to be light on MVC in general, my former colleague Thaylin Burns put together a MVC walk through on his blog as well.
MVC (Model-View-Controller) introduction simplified.
There is also a very simplified lesson by Colin Moock that some might find helpful as well: Colin Moock’s MVC Lecture.
Enjoy and please give these authors feedback on their work.