My favorites include:
"O come let us adore Him"
"O come all ye faithful"
"Have yourself a merry little christmas"
"Jingle Bell Rock"
"Rockin' Around the Christmas Tree"
By the way AXO Alum, have you tried Barnes and Nobles for the home alone soundtrack? I think they would have it for sure. I never even thought about that as a great christmas CD, but thats a good idea!