I thought more titles had the option to switch between the two API's?
I haven't seen a game that gave you the choice since Half-Life 1, ten years ago. Not that I've played every game out there, but that's the sense I have. There's just no reason today to put all the work into developing, debugging, and testing both an OGL and a D3D renderer.
I'm seriously debating dual booting windows.
At least with the Intel Macs dual booting Windows is relatively painless. :yes: