Are you looking for resources on Santa Claus or the birth of Christ? Or both?
For the birth of Christ, I have a few movies I like. They are straight out of the King James Bible, with music in the background, so they're complicated for toddlers to understand on their own, but they're beautifully done. They won't teach your kid the story, but if you've been telling the story every day for a month, like I have, your kids might like watching it. Of course, it was my 3 year old who loved these; my 18 month old watched but I'm not sure how much she got out of it. Anyway, here's the link:
http://www.lds.org/bible-videos/videos/?lang=eng. The first one is The Nativity, which covers the whole story. You can also hit the "Show More" button at the bottom until it has all the movies displayed, and the last few are Christmas themes as well: the angel coming to Mary, Mary and Joseph going to Bethlehem, shepherds and wise men, etc.