I really hate to be devil's advocate, but a lot of what everyone's mentioned here can be done on a PC. And, sorry to say, on Windows as well.
... and added a user account for myself with MobileMe Back to My Mac on it.
I got a call from her this evening, so I shared her screen from my house and sorted it out for her, can you do that on a PC? Probably, but not out the box, and I bet it isn't nearly as simple.
Yes, this can be done on Windows, and yes, it can be done out of the box. Just access the appropriate utility in the start menu, it's name eludes me at the moment, but I'll boot into Windows and check later.
I've only once had to install a driver, and that was for a PVC card printer so hardly a common piece of hardware, all my other printers truly do plug and play.
I recently installed a printer on windows and it confused the hell out of me, and kept popping up to tell me my ink was low and stuff, I KNOW!!
I've never had to install drivers under Windows either, Windows usually takes care of it itself and downloads the appropriate drivers automatically-- without getting the user involved. Plug and play.
Windows PC always seem to have the US keyboard layout, even here in the UK.
I use the US layout so I haven't encountered that problem, but I can see that being annoying.
Mac software always seems to be of higher quality than stuff I've used on windows, I think Mac software developers hold themselves to higher standards.
I think the fact that Windows has more apps gives the impression that they are of a poorer quality. I've come across some fairly crappy Mac apps in my day.
Not trying to start a flame war or anything, just pointing out that all the stuff we appreciate in OS X with a Mac can now be done, most of the time just as easily, in Windows. The versions of Windows that we all dumped to switch to OS X; Windows 2000, Windows Me, Windows XP, and Windows Vista (non sp1)-- aren't the Windows of today.
For the first time, it looks like Redmond is innovating, and Apple's falling behind. Windows 7 seems to be a bigger improvement than Snow Leopard, which has disappointed me, at least, and the Zune HD looks like it's going to be good competition to the iPod touch, which hasn't really changed since day one.
With functionality being essentially on par (for the average user) and with PC's being the cheaper option, especially during the economic slump, is it time for people to finally consider Windows?