Here come two binary packages for Mac, FlightGear-2.0.0-r284 and FlightGear-git-20110602.
FlightGear-2.0.0-r284 is an update package for 2.0.0 release for fixing a major crash issue during splash screen. This updated is recommended for all users.
FlightGear-git-20110602 is a developer release that provides bleeding edge features of FlightGear as of Jun-02-2011. This release is not fully tested so it might not be stable compared to 2.0.0 packages. Therefore, you should use it at your own risk. But don't worry, I haven't seen any critical problem that may hurt your Mac hardware so far.
As always, you can download these from the Downloads page.
Hope you have a great and stable flight experience,[...]