What movies have great director's commentary?



I've listened to Joss Whedon's director's commentary of Serenity (and Objects in Space and The Train Job) over and over and over again. I could listen to these again, but what other movies have commentary that speaks interestingly about either film-as-art or film-as-moviemaking? Kurt Wimmer's commentary on Equilibrium was also enjoyable just from the down-and-dirty aspect of making an actual movie. Conversely, Brad Anderson's commentary of The Machinist and Aronofsky's commentary of The Fountain were excruciatingly boring and uninteresting commentaries of otherwise interesting and thematic films.

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