Now this looks interesting: Trigger.
It’s an open source racing game. Right now, the feature set isn’t terribly enticing, but they plan to add Mac OS X support and network play.
Now, if one of the goals of the game can be utter carnage instead of mere racing, we may have a replacement for the venerable Carmageddon 2: Carpocalypse Now, and one that runs natively on OS X, no less.
Must investigate further…
Thanks to Gadgetopia for the link.