I think Civilization 3 Complete is pretty nifty, and works well on a MacBook even in emulation. All the Apple retail stores I've been to have most every current game available on the platform at the time. Granted that isn't much if you're coming from the Windows side of things, but that's just sort of how it is. I imagine if you were using BootCamp with a Win XP installation, then Resident Evil and Silent Hill would both probably run just fine. I don't believe those two games are available on Mac OS X, though.