I think the iPod has been Apple's back door into the pc market. The iPod is everywhere, just like pcs, and since it's so easy to use more and more pc users are going to a mac.
Now that we're in intel processors there's going to be less and less difference between macs and pcs, and we'll probably be able to run both systems simultaneously or have one system that runs both (hello Unix and Linux!). The lines are blurring and the mac just looks better overall.
Of course I have just bought a pc laptop so I can start programming in .net. It does have some great features, and starts up faster than my G4 powerbook, but oh the virus and spybot threats are amazing!