Bzzzzt Wrong. Doom III is already running on Macintosh computers although it is still not avaliable for sale, but really I've played it... Nothing worth playing to be honest and I'm a "hardcore" gamer so I know what I'm talking about.
Sorry, that last post made me seem arrogant and angry. Also to clarify, I played it through on the PC (no illegal activities for me). Besides most people don't use their Macintoshes to waste time, they use them to make their lives easier and their work more efficient.