The only *real* competition that Mac has is Linux. OSX isn't very hacker friendly. You just can't download and recompile the libc or kernel to your liking. Still, I'm installing Linux before Hackint0sh.
If only Sparc's 256 threads had good double-precision floating point, then it would've been Dreamworks-Sun. Oh wait, mabye the deal is Itanium processors. I just skimmed the article ^_^