DrunkenBlog: The Squandered G5 – a worthwhile read, with some good points. Some things I’d add:

I personally like the yearly OS updates, I think it’s generated enormous amounts of good buzz/excitement (especially as the competition continues to stagnate/remain inadequate), but it is annoying that 1/4 of my programs get broken w/ each upgrade, and at least half of them end up either dropping support or needing to release separate versions for each flavor – in the long run, Appleneeds to start either standardizing APIs/handling backward compatibility or face larger developer/user backlash
Lack of any G5 speed bumps probably hurts Apple credibility/mindshare even moreso than lack of Rev B (outside of the Mac community). Also, Apple has really dropped the ball on the low-end. It’s a wasteland. (a cheap headless box would sell like gangbusters I would suspect, and maybe even help w/ international adoption)
Lack of drive expandibility is probably the biggest reason I haven’t requested a G5 at work (lack of VirtualPC hurts too)
My Rev A 12″PB has been running like shit lately, especially w/ how the fan is now on all the time thanks to the latest 10.3 updates. I’d get a new G5 PB in a heartbeat