Here is a simple "Hello World" type of application using Cairngorm Extensions from Universal Mind.
This application demonstrates the following two features of the Cairngorm Extensions:
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I just saw that Universal Mind Cairngorm extensions for Flex are now set up on RIAForge (thanks Andrew).
We have been using the UM Cairngorm Extensions at Straker Interactive (where I work) for ZoomFlex since about six months.
One of the features that I really like about the UM extensions is the ability to combine together event-business logic. Given that any real-life application (like ZoomFlex) has quite a few commands, having a separate Command class for each command can become quite overwhelming. The ability to aggregate command logic into context-specific command classes is very useful.
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I recently wrote a sample Flex application -- a simple Flex RSS Reader -- using Cairngorm. I find that learning Cairngorm is made easier by looking at simple applications like this one. And the one I wrote earlier -- a simple contact manager. When one looks at how Cairngorm is implemented across multiple applications, one starts seeing common patterns. And that is exactly the point of a framework like Cairngorm. Learning the framework is made easier by the fact that there is a certain repeatability and consistency in the way a Cairngorm application is structured.