So much in-fighting...
It's fairly obvious that anyone choosing a computer (on any operating system) wants first and foremost two things:
Reliability and Choice.
You'll turn to Apple for reliability, since Macs are made for OSX, and vice versa.
But the majority of people will pay a visit to the competitor because they want choice, and at a competitive price.
This is the foundation of anti-trust: The lack of choice for end users. And I'm sure Psystar will use this argument as their first line of defense. (Notwitshtanding that anti-trust also means the inability for a competitor to compete - but is that an argument in a closed market such as Mac?)
Lack of choice is certainly an argument I'd side with. As people regularly point out, Apple slap a huge premium on factory-installed RAM and other components. You can purchase and install these seperately of course, but even so there's a corner of the market that sees waste and a penny spent that needn't be.
Dell, for example, are no better - but Dell has an open market to compete with, and has been (slowly) improving on it's component pricing.
Without any competition, there's no compulsion for Apple to improve on it's offerings, or be generous - and don't think Apple are generous, because they're a hell of a lot greedier than Microsoft. They're not for 'the people'.
I like macs. I like OSX, and I like the fact that it peeves off Windows users no end. But I haven't liked Apple for a very long time.
All of that said, I experienced the 'legitimate' Apple clones first hand, and with that foreknowledge, I have to say that I'll ultimately choose stability over choice. Just look at how Vista is struggling with having to support virtually unlimited configurations of hardware.
OSX and Mac are made for each other. And that's the way it should stay.