Preparing for Adobe Flex 3 + AIR certification

I’m preparing for the Adobe Flex 3 + AIR certification and I would like to share two AIR applications which I’m using to study an test my Flex knowledge.
The first is pretty famous, so maybe you already know it: Tour The Flex.
It provides hundreds examples of all components available in the framework and includes Adobe reference.
The second is a real helpful app (which I discovered through Twitter), because it consist in an exam simulator (flex 3 + air). Is possible to choose between 8 different test, once a test begins a timer will show you the remaining time and at the end of test the reached score will be showed. Wrongs questions will be explained and you’ll be pointed to Adobe reference for clarifications.
The (free!) application is available here: http://software.pxldesigns.com/attest