Dvorkak has used Macs on and off since the eighties. He used to write the Devil’s Advocate column in MacUser Magazine. However, as his contempt for Apple grew, I felt his columns were counter-productive to the goals of a Mac-based periodical.
He’s actually been using a Mac for a while now in addition to a Windows based machine. I’ve heard him refer to his Mac a few times on the TWiT podcast.
My hunch is that his contempt toward Apple has softened, or perhaps is now less than his contempt for Microsoft.