I have seen several postings both in the blogosphere and on Facebook about favourite Christmas movies. To be honest, I don't know that I have seen any explicitly Christmas movies that really turn my crank.
I have been surprised at the number of times people list one of the "Die Hard" movies as a favourite Christmas movie. I think I saw Die Hard once many years ago. I don't remember anything about Christmas in it, but I do remember that I didn't much like the movie.
What's my favourite Christmas movie? Well, if people think Die Hard is a Christmas movie, then certainly "Three Days of the Condor" qualifies as a Christmas movie --- it has several scenes that are clearly related to Christmas.
If not "Three Days of the Condor", then maybe "Animal House"? ;-)