Parallels, VMWare, etc. won't help with direct x10 graphics. That's where my Mac breaks down.
@dennisb
There is a larger variety on the PC. And the software is definitely cheaper. But PC's are a whole lot buggier. My main reason for using a Mac was the interface/ease-of-use, and a more stable OS. There's nothing worse than a PC locking up after 3 hours of rendering.
I think the main reason people went with PCs was because they're cheap. Now that Apple has switched to Intel, pricing is much more comparable. With Open Source you can get a lot of the same software that the PC has. Having said that, there is no real gaming market on the Mac. You're definitely better off developing games for the PC, and doing it on the PC. Unless you are developing for the iPhone. That will be a growing market for a while.
"Everyone has a plan 'till they get punched in the mouth" -- Mike Tyson