I've been using this method to make UUID strings:

+ (NSString *)stringWithUUID{  CFUUIDRef uuidObj = CFUUIDCreate(nil);    
NSString *uuidString = (NSString*)CFUUIDCreateString(nil,uuidObj);  
CFRelease(uuidObj);  return [uuidString autorelease];}

How do you all like it? Is it ok? It's based on some code I Googled a while 
back. In particular, is this code perfectly garbage collection safe?
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