Well RIM just released their newest Blackberry Playbook SDK for AIR. This time around the SDK will work with Flash Builder 4.5 (code named: Burrito). On top of that people have really jumped into the whole AIR on Android scene. If you are a Flex or ActionScript developer and want to build applications for Android devices as well as the soon to be released RIM Playbook then visit the Adobe Labs site and get your hands on Flash Builder 4.5 and the Flex 4.5 SDK (code named: Hero).
I will be blogging about my experiences soon, but right now I can say that it is very easy to develop for both Android and the Playbook using the SDKs and Flash Builder 4.5.