My favorite are the iPod zealots, like no other MP3 player can compare. Yet the conveniently dismiss the inherent problems with iTunes. 
Well, iTunes has problems no doubt, but the user interface of the iPod is second to none... At least to me.
I run Fedora pretty much everywhere... I did have OS X on my Dell... yes, my dell, but the sound never worked right, so I put Fedora back on that.
All I run is linux for the most part...
I do like OS X... I have a Dual G5 powermac and it's still a great machine... Does everything I want.
The G5 is a great CPU... I think the powerpc is better than Intel or AMD... I think Apple switched to Intel for mobile reasons... IBM never could get a cool G5 in a mobile machine and that was killing Apple's business... 1/2 of all of their sales are mobile machines.
I run Windows under VMWare (using the new 6.0 beta right now) and it's fine for what I need it for. (Mostly dealing with work applications), so I use them all... I'm just not impressed with Vista.
I'm not Apple Fanboy by any stretch... It's a tool, nothing more... the best tool gets my money nothing else.
If they made iTunes for Linux (cause yes, I have an ipod and I really like it) then I would never use a Mac or Windows again most likely.