Althought i haven't finished the game yet, Anachronox looks promsing, for the setting if nothing else. I love the art style/environment.
The Curse of Monkey Island would make a great comedy. I wonder who would play Guybrush? I can't think of anyone who could really pull it off.
This is all assuming it was in the hands of a competent writer/producer.
Fat chance.
If you think about it, there are lots of games that would make good movies. It would just take someone who was interested in actually making the movie true to the game, which is unlikely to happen as most hollywood producers/directors/studios just want to appeal to the lowest common denominator. Whatever makes the most money.