Flex 2 for Linux

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http://labs.adobe.com/wiki/index.php/Flex_2_for_Linux
From Adobe Labs
With Adobe Flash Player 9 for Linux beta and the free Adobe Flex 2 SDK, Linux users will be able to take full advantage of the Flex development model for creating and deploying rich Internet applications. Flex developers will be able to use the free Adobe Flex 2 SDK together with their editor of choice to develop and deploy their Flex-based applications entirely on Linux machines.
The free Adobe Flex 2 SDK and free Adobe Flex Data Services Express can be downloaded here.
Please note that we have not yet released the "debugger" version of the Flash Player 9 for Linux. This is required to use fdb and write trace statements. We expect a beta version of this Player to be available in the near future.
You can find all sorts of information about Flex including documentation, support resources, and even more downloads at flex.org.
FAQ
Will future versions of Adobe Flex Builder be available on Linux?
Adobe has not publicly announced plans to release versions of its desktop tools on Linux. The free Flex SDK and Flex Data Services (which also has a free version) are supported on Linux today.