If you're interested in application security for Flex/AIR applications hit the Google code link for the milestone release of Component Security Manager. Many thanks to everyone that offered input on this release - I appreciate it muchly.

For those of you who would like an introduction: ComponentSecurityManager uses the principle of least privilege to restrict access to or visibility of controls, containers, and non-graphical application elements using a variety of techniques including preserved metadata, loose binding, and bound approaches. The library is intended for use in Adobe Flex and AIR applications.

Google Code (source, examples, and documentation)
http://code.google.com/p/componentsecuritymanager/

Google Group (recommendations, feature requests, or complaints)
http://groups.google.com/group/component-security-manager