There's already a garbage collector in the Objective-C runtime for regular Mac OS X. People targeting OS X 10.5 and higher (that's anyone writing a new app) are

There's already a garbage collector in the Objective-C runtime for regular Mac OS X. People targeting OS X 10.5 and higher (that's anyone writing a new app) are happily using it. They've just chosen not to enable its usage on the iPhone.