The Concept: http://docs.info.apple.com/article.html?artnum=300989

In short, I’d like to know if anybody has implemented this as a sort method for easy use with -sortUsingSelector:. Any Objective-C implementation of the Unicode Collation Algorithm to lend Finder-like filename sorting to my apps would be most helpful.

To sort like Finder: http://developer.apple.com/qa/qa2004/qa1159.html

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There’s some code on linked to on General/IgnoreAccents. Read the discussion - the linked code has a bug.