delta: Everything Apple is doing that's not *only* technically possible on Intel - like Boot Camp - is Universal, working on Intel chips and PowerPC. So yes, Objective-C 2.0 runs on PowerPC, as well as garbage collection. (In 10.5, you have three choices: Objective-C 1.0, Objective-C 2.0 or Objective-C 2.0 with GC. And the Ruby and Python bridges, naturally, which are garbage collected natively.)