My favorite Christmas music:

The Calling's version of Carol of the Bells (or any version for that matter, especially Trans-Siberian Orchestra's)

Snoopy vs the Red Baron by The Royal Guardsmen

Jack Johnson's Rudolph The Red Nosed Reindeer

Trans-Siberian Orchestra, Relient K, and Barenaked Ladies Christmas CD's

Newsboy's Christmas songs

Anberlin's Baby Please Come Home

The Stowaway by Murray Gold as appearing in Doctor Who's 2007 Christmas Special

Shake Up Christmas by Train

EDIT: I'm pretty sure most of you have heard Carol of the Bells. Looking up "Trans Siberian Orchestra Christmas Eve/Sarajevo" might refresh memories.

-CF