Adobe has announced AIR for Linux in a pre-alpha release on the Adobe Labs. Personally I think this is a great step for AIR and brings truth that Adobe knows what true cross-platform really is.
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From Adobe Labs:
Flex Builder Linux is a plugin-only version of the Flex Builder that you can use to build Flex applications on Linux. We wanted to get an early release out with the base Flex Builder features so you could begin to provide us with...
