VDrift 2011-09-01 has been released for Linux, Windows, and OSX. It's considered a stable release, and has a number of improvements to physics and graphics since the 2010-06-30 release. Differences from the last development release are primarily bug fixes, although I did add auto-update functionality to cars to test the water and see how that works. As always, feel free to post any questions or feedback in the forums.