twitterAIR has been updated for AIR 1.0 skipping right over AIR Beta 3. Not much has changed in the new version though. I squashed a few bugs, got rid of the zip file download (which means I can't track downloads anymore) and implemented a seamless badge install.
If you don't have the latest AIR runtime (1.0) on your machine, the twitterAIR installation will install the runtime for you. If you're running an older version of twitterAIR, just use the badge install to update your copy.
For more on the announcement of Flex 3 and AIR 1, click here.
Get twitterAIR here!