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Wow, so it does! (Along with the other more common keyboard layouts.) You have to dig under the "advanced" settings but it's there. Neat!

That's really cool, I should file a radar (not that it matters) in Apple's radar so that they make Colemak available on iOS.

Yes, this is right (on 4.3 at least). You can choose between QWERTY, QWERTZ, AZERTY, Dvorak and Colemak.