I haven't started my game's Mac version yet (all the other team members are PC guys) but I'm going to use CodeWarrior 6 (or 7 if its out when I start) and the Carbon API. I want to remain compatible with OS9 for now, and I hate ProjectBuilder and don't feel like dealing with Objective-C I know I know, I'm a lazy ass!
Okay, thanks. I've got some basic OpenGL stuff going with ProjectBuilder, it's not bad but it's not quite DevStudio either. It may be sufficient for my needs, if not I'll have to move to either gcc or CodeWarrior.