While most of what Lee at Music You (Possibly) Won't Hear Anyplace Else shares each week in his Sunday Morning Gospel series doesn't necessarily qualify as "official" Christmas music, it is certainly of great interest for anyone interested in the history of recorded inspirational music of the last century. I would think there would be a pretty decent sized overlap between serious lovers of Christmas music and those who delight in the broader genre of Christian music. If you fall into that particular demographic you owe it to yourself to check out Lee's Sunday morning posts.
In fact you should be heading over to Music You (Possibly) Won't Hear Anyplace Else on a fairly regular basis anyway for all his amazing vintage shares, facinating articles, and thought provoking commentary!