My personal favorites:
http://www.youtube.com/watch?v=D2va8ddcY4E
Post your faves below
Trans syberian orchestra carol f the bells.
Any actual Christmas carol, not the “Santa! Yeah!” stuff, though occasionally that’s fun too.
I’ve also always liked these a lot (well, the second one isn’t that old, but since I heard it anyway):
http://www.youtube.com/watch?v=uzVqDIzvCeI
Plus the Muppets Christmas album with John Denver. That’s probably my favourite Christmas album. That, or the Vince Guaraldi Trio one.