Once again, the people that don't use them call them crap.
I've been using, programming, fixing, selling, consulting on and managing computers since I got my Atari 400 in 1978. I pretty much made my career on MS. I've used every piece of software written my MS (as far as I know).
Not only is the mac more stable, easier, less prone to viruses/malware (and no it's not because it's less popular it's due to the way it was designed - which comes from it's Unix/NEXT roots and which microsoft is trying to emulate in Vista/Win7), OSX is also more scalable - is stable 64bit - you can script ANYTHING you want (unlike windows). As far as I'm concerned is just as good as linux except that it works.
Many game developers started to port and even program for the mac, and Microsoft threatened to pull their distribution rights.
Coming from MANY years of experience, I prefer a mac at home and wish I could use them at work.