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It may be easier on OS X than other platforms, I don't really know, but Mac OS X, despite a lot of talk over the last 4 years or so, remains not fully resolution independent, and the new iOS approach is a pretty big departure from what has been going on in Mac OS X.
"iOS's implementation of resolution independence is the best and most standardized implementation that exists."
How do you know that? You don't even know that alternatives even exist, and here you're passing absolute judgment on them? Sorry, but you're woefully ill-equipped to make that statement.
For the past three major releases of OS X I've been hoping for a move to resolution-independent "fixed-size" interfaces. That is, the interface will take up the same physical size on any screen (unless you choose to zoom it in or out). What's holding them back?
iOS 4 is the first OS to be completely resolution-independent. Even Android's attempt at resolution independence is not widely supported well by Android apps.
Any Android app by a competent developer will look great from one resolution to the next. Now the iPhone can do that too, just with some growing pains as developers update their apps to provide higher-definiton resources.
It's great that the iPhone is progressing, but there's no need to adopt this "finally Apple gets it right!" stance and trash their opponents who have been for years doing pretty much the same things you tout as revolutionary and unprecedented.