Has anybody here played any of the games on The Orange Box? (Team Fortress 2, Portal, Half Life 2, Half Life 2 Ep. 1, Half Life 2 Ep. 2)

If so, on which platform, and which of the games? I've only played Portal (because that's the only one I've installed thus far), and it is an extremely fun game, if you don't mind thinking every now and then, sadly, it's very short. Oh well, I'll be playing TF2 once I finish it (today or tommorow...).