I also love White Christmas. Holiday Inn is great too. and I LOVE the Grinch (the original cartoon version, not the newer one). Probably my favorite, though, is Its a Wonderful Life with Jimmy Stewart. Such a great film. least favorite? Hmmm. there are so many to choose from. I actually really get tired of the so-called 'feel good' Christmas romances that have absolutely no plot or character development. I've seen plenty of them because my parents collect them. They have a thing for Christmas movies and can't seem to edit their collection. :) gotta love people's fetishes, eh? :)
I like White Christmas and It's a Wonderful Life. Really love Christmas Story as well. I'm with you on Peanuts.