The Polar Express - I'm 19, but I adore this film. Definitely check it out if you've never seen it. It made me feel really nostalgic and manages to capture the spirit of Christmas. It may be a kiRAB movie, but I think older generations can appreciate it too. I no longer count down the days to Christmas (it lost its charm to me a few years ago), but this movie takes me back to the good old days when I wouldn't be able to get to sleep until the early hours of the morning because I was so excited. I really love this movie.. sorry for going on! But I don't think this one gets the praise it deserves.
Bad Santa - A much more realistic Christmas movie.
Christmas with the Kranks - Not a great movie, but I find it really enjoyable.
Home Alone is great too. Used to be a family favourite when I was a kid.
Die Hard. Not really a Christmas movie, but it does take place around that time.. and it has snow, so... lol.
Jack Frost - The family movie, not the horror. Loved this as a kid. Less so now that I'm older though.
I may be forgetting some. There are lots of other great Christmas movies, but these ones are my personal favourites.