Well, I voted for A Christmas Carol, although I am finicky about the particular version. For me it has to be George C. Scott's, though I have seen just about all of them, I think.
I also love Rudolph, Charlie Brown, and A Christmas Story.
Oh, Belladonna, The Holiday!!! Love it love it love it.
Mike, I remember The Little Drummer Boy. Do you remember Mr. Magoo's Christmas Carol?
Dickens's Christmas Carol is probably my favorite secular Christmas story, but we also pull out certain religious films around Christmas time, either Ben Hur or Jesus of Nazareth. Come to think of it, those are our favorite Easter films, too!