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Oh im sure you can upgrade certain parts but as you have said earlier the OS is tied to the hardware. So you are limited to what type of anything you want to swap out. So if the hardware is not Mac OS certified you cant really fully use it right.
That is actually not really true. Any windows compatible hardware will work in a mac, under windows. Most standard parts like, DVD/CD Drive, hard drive etc. will work under OS X. Most USB things like TV tuners, web cams and such will work, the exception was video cards, and that is actually changing.
And if you happen to find a USB device that wont work under OS X, you can start up Parallels or Vmware Fusion, and use it with in OS X using what ever windows software was required.
You can take many PC video cards and use them in a Mac under OS X now. All that is required is that you flash the video cards rom. Which now is really easy.
You just wont get the latest cards right away. Like there isn't a rom for a 5870 right now that I am aware of. You can use the card in a Mac, it just wont work under OS X.













