Apple – Support – Downloads – iMac Software Update 1.0
About iMac Software Update 1.0
This update provides important bug fixes and is recommended for 20-inch and 24-inch iMac models with 2.0, 2.4, or 2.8GHz processors.
Ummmm…. OK that’s nebulous and user friendly, but what are they really updating?
Some more graphics drivers updates, just like the Mac Book Pro Software Update.
And to expound more on that, these two items are the Rosetta PPC-to-Intel binary translator and the OpenGL bundle that is called by PPC games needing OpenGL routines in Rosetta.
So… I guess that means that the copy of Marble Blast Gold that I’ve hung on too since my first iMac will be even more awesome on a new 24″ iMac ;) It’s nice to know, though, that they are working hard to maintain support for PPC graphics apps.