+[NSString stringWithString:] — what’s the point?

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You might have a NSMutableString (or some home-grown NSString subclass) that you want to duplicate.

NSMutableString *buffer = [NSMutableString string];
// do something with buffer
NSString *immutableStringToKeepAround = [NSString stringWithString:buffer];

Of course, you can also just make a copy:

NSMutableString *buffer = [NSMutableString string];
// do something with buffer
NSString *immutableStringToKeepAround = [[buffer copy] autorelease];

but you own the copy and must release or autorelease it.

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