Debating over who likes mac and who likes PC is rather like trying to figure out why some like Wings3d and some like maya.  Its all simple preference to the user.  That said, lets look at the commercial (and its other ad campaigns) a little more closely.

I actually think as a consumer, mac is doing a disservice to itself in how its portraying itself....... as this "fun seeking cool kid".   Though amusing with vista, of course, and its noted problems, thats a program, not the PC itself.   So the vista aside, lets look at the two and how the mac commercial's portray them.

Mac:  Cool young college looking guy out to have a good time
PC:  Serious business suited man looking to work.

Personally, as a consumer, I want a computer that is "serious machinery", that will do the tasks I ask of it, yes for business, as well as what else i know a PC can already do by using one so many years.  Make films, art, play warcraft and do my taxes.   The idea that a PC only runs windows alone and a word processor is actually showcasing in mac commercials that they have no clue what a PC can actually do.

Mac highlighting whats "wrong" with a PC, but not highlighting whats actually user compatable in a mac..... "It can do what you already do but better" (which should be the idea), its not selling too many people on it.  If as portrayed, PC users are all serious stuffy business people crunching numbers, well......... they aren't going to make any sales anyway telling that stereotype "hey, lets make a goofy movie!".

So to find out anything of what a mac can really do you have to either, find someone who has one and have a look, or search around all over for the specs and information.  I've done both, and have found really, nothing a mac can do, that my PC can't.  Its basically a computer with a different operations.

I know several people in manhattan that work for a graphics firm and they all have macs, because the idea is macs are better for graphics.   I have gotten the lectures from all of them, that i should be using a mac for what i do because its "better"................. then I show them my work.

"You made that on a PC?".
"Yeah, HP Pavillion".
"Oh.......".

It would appear they had no idea I could do that LOL.