Adobe release new betas today of AIR and Flex 3.

Adobe AIR Beta 2
Adobe® AIR™ lets developers use their existing web development skills in HTML, AJAX, Flash and Flex to build and deploy rich Internet applications to the desktop.
http://labs.adobe.com/technologies/air/

Adobe Flex 3 Beta 2
Adobe® Flex™ 3 is a cross platform, open source framework for creating rich Internet applications that run identically in all major browsers and operating systems.
http://labs.adobe.com/technologies/flex/