As the Machead of the list, I'll weigh back in.
BTR is right, the Windows emulator programs for the Mac have been unstable and unreliable. However, the new Intel Macs don't use emulator programs. You install a piece of "firmware" called Bootcamp, that then allows you to install Windows XP, or any other Windows operating system that works on an Intel processor, including, supposedly, Windows Vista that's been delayed due to, ummm, major security issues. Then, when you start up your Mac, you can choose whether it boots in OSX or Windows. You can't, however, run the two simultaneously. I know, I've already tried on my Macbook Pro. However, it does run Windows XP spendidly, and the Windows applications from my office that I had been not using run just fine in Windows mode.
The Mac OS is preferred by many of us because of its stability. On both my old laptop and on my new laptop, I have never had my OS crash. I have had an application or two crash, but usually because I was trying to do something, I, umm, shouldn't. I've also never had any repair issues. I had my 12-inch Powerbook G4 three years, and never once had a crash or a problem, and I almost never turned that baby off. I've had my MacBook Pro since mid-March, and it ROCKS!
Of course, I also teach publication design and graphics, for which there is no equal when it comes to the Mac. I've run Creative Suite 2 on both the PC and the Mac, and there's no comparison between the two. It's far superior on the Mac. You have more features, more stability and ease of use. And the shortcuts available on the Mac are fantastic.
Of course, if you want to wait a year, you'll have a Mac on the PC anyway, more or less. It's called Vista. If you don't believe me, go to
http://www.watchmactv.com/ and dig up "The Real Windows Vista" video that is Bill Gates' actual audio introduction to Windows Vista, demonstrated on a Mac running OS 10.4. That's the same demonstration where Gates stormed off the stage during the Q&A when a reporter asked, "Is there ANYTHING in Vista that isn't a direct rip-off of Mac OS X?" It's hilarious, especially when you watch this and realize EVERYTHING Gates describes about being wonderfully new in Vista is already in OS X.
So, I guess another reason I have a Mac is because I prefer the original, instead of the blatant rip-off.
As far as OS X (and future Mac operating systems) running on a PC, I imagine it's only a matter of time.