Apple appears to be actively recruiting individuals to improve their Mac Open-GL implementation according to a post on the Mac Open GL mailing list.
The Apple, ATI and NVIDIA OpenGL software teams are looking for a diverse set of talented engineers who would like to be a part of the fast paced world of 3D graphics. Apply your skills to help make Mac OS X the best OpenGL implementation in the industry.
Open GL is the programming interface for 2D and 3D graphics used by game programmers to provide graphics acceleration to their applications. Apple's interest in accelerating the Mac implementation may come from recent disappointing Mac Doom 3 benchmarks.