The Cairngorm framework has proven exception in providing a simple, lightweight methodology for Flex development, but its strength rested on application to database communications. Intense visual development was left without much support, or overuse of the Singleton ModelLocator, creation of ViewManagers and other constucts.
I have been reading up on this framework, Pure MVC, which looks like it offers a complementary approach to Cairngorm for Flex/AS3 development. It’s possible elements of this could be adapted for use in Cairngorm framework implementations, and vice versa, but I’ll need to try it on its own first, and see. It’s definitely worth a look: http://www.puremvc.org