commodorejohn said:

Themeable is good, but consistent underlying behavior is more important. That's where Linux really trips up, since there's approximately 47 different UI toolkits and 11,000 deviations from even those meager standards.

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I agree 1000%. One of the few areas where OS 9 is still arguably superior to OS X is in UI consistency. Even with additions like the Windowshade functionality, classic Macs seem more predictable IMO. Later versions of OS X seem far more concerned with stylistic issues than usability ones, to the occasional detriment of consistency, and I agree with that one columnist at Ars Technica about all the many flaws associated with abandoning a spatially consistent UI model for the Finder. Of course, that can of worms is only tangentially related to the topic at hand, so I will stop there.