Here are some of the popular ones, at least here in America where we recognize that commercialism is the true point of Christmas, and not that pesky Jesus' birthday stuff.. :

1) The Grinch Who Stole Christmas
2) A Christmas Story (AWESOME movie, a must see, so funny)
3) Santa Claus Is Coming To Down
4) The Life and Times of Santa Claus (by Roald Dahl, kind of morbid and dark)
5) Frosty the Snowman
6) The Night Before Christmas
7) A Christmas Carol
8 ) Rudolph the Red Nosed Raindeer
And others..
**Edited because my #8 above turned into a smiley
-Bill