Source: http://feeds.gawker.com/~r/gizmodo/full/~3/GXcBnIXx354/opengl-30-support-leaks-in-os-x-1063-beta
Apple's not always the quickest on adopting new standards (or even old standards). Luckily, their OS X 10.6.3 beta has revealed at least partial support for OpenGL 3.0. [Hardmac via AppleInsider]