Well there were lots of Chirstmas movies and specials that I loved, including all the Rankin/Bass ones. My favorite out of all of those would have to be Santa Claus is Comin' To Town. I got that on DVD late last year and it was a treat to watch it without it being interupted by ad breaks.
Others include Elf, The Santa Clause 1 and 2, Chirstmas Eve on Sesame Street, A Very Brady Chirstmas, In the Nick of Time and Prancer. Mind you, there were others.