I recently played Half Life 2: Episode 1 with the commentary on. It's very interesting, actually, and gives you some nice Game Design information.
I was wondering, if I (or anyone else) put an Audio Commentary system in a game (as an extra option, or after you beat the game), would you play through the game again to listen to it?
I probably would, if I liked the game. I think it'd be nice to hear the developer's thoughts on the general design and little points of interest, or perhaps an area that was particularly difficult to create.
I remember Rebel Strike (Gamecube) had an audio commentary for each level in the game. I never bothered sitting through any of them though. It was difficult enough to complete a level without having two geeks talk about the game engine in the background. Ecks-dee.