I'm just looking for a short list of some famous movies that have alternate endings. One notable example would be Terminator 2, which actually had a better ending that wasn't used simply because there would have been no place for a sequel if it had been.
Hmm...one that comes off the top of my mind would be the movie 28 Days Later. A Brit apocalyptic/zombie film set in London the movie was shown in theaters with 2 different shot and edited endings, plus theres a 3rd storyboard ending on the DVD itself.
I didn't make it!
Point Break, Knock on the Heaven's door, Revolver. You can download them at fun-dls, by the way :).