It would be a shame to regurgitate the above posts, but again, quite lackluster, Tuan. The funny part is that most of the utilities you mentioned when touting OSX are actually present in Vista (most obviously, the accelerated desktop with seamless animations). If you're gonna go comparing, compare latest gen vs. latest gen. Although OSX is *nix (I think BSD) based, *nix it is not. Heck, even Torvalds has been critical of the file system.
There is yet to be a rational pro-OSX argument aside from the general idea of "usability," which, admittedly, Apple spends a lot of time on and usually gets right. I gotta say though, I was forced to use one of these atrocities at a BestBuy the other day to access internet, and I was quite turned off by several things that appeared to be major annoyances. I am an experienced user, though, and like things to be my way; easily accessible; not screwed up. And I use all 5+ buttons on my mouse and the scroll wheels. The one-button mouse MUST DIE. A painful death.
Out of the box, for a clueless person, Macs are indeed a good (albeit expensive; read the posts above) option. But c'mon, let's hear something actually convincing.
How about this. The next version of Photoshop will only natively support x64 in Windows. This does result in better performance with larger files, and the media-junkies are Apple's historical bread and butter (by the way, write about WYSIWYG, color management, etc. for Apple, which is much better, actually). Whoops.
Anyway. Better luck next time.