Portal: completed, again

Steam was released for the Mac in the last week, and as part of the initial offer you can get Portal for free. In fact, I'd get Portal for free anyway, because they're saying that if you bought it for PC, they consider you bought it for Mac as well. Very generous of them.

So I've completed Portal's main story for the fourth time (PC, PC with commentary, Xbox 360, Mac). I didn't buy my Mac as a games machine (I have enough consoles for that), but other than when Time Machine started whirring away the performance was great. As is that game, still.