[neverending]

Well, of course any of Bob Rivers' Christmas albums- White Trash Christmas, Chipmunks Roasting on an Open Fire, etc.
Stan Freburg's classics
Spike Jones has a 20 minute long version of the Nutcracker that is amazing.
South Park's Christmas Album
The Jingle Cats (love em or hate em - I love em)
Christmas time is so ripe for comedy there's so much to chose from...