"Winter Wonderland" by Bugs Bunny (and pretty much anything from Looney Tunes Kwazy Christmas. I guess I'm just as looney as them. lol)
"Christmas Time (Don't Let The Bells End)" by The Darkness
"Let It Snow", "Blue Christmas" and "You Just Gotta Love Christmas" by Peter Cetera
"Christmas Is All Around" by Billy Mack (Bill Nighy)
"Christmas In Hollis" by Run D.M.C.
"Hey America" by James Brown (Da Godfather Of Soul!

"Last Christmas" by Rei Hino (Sailor Mars, this is from one of the japanese Sailor Moon Christmas CDs, and it's sung in english! And it was written by George Michael)
"Back Door Santa" by Bon Jovi
"I Won't Be Home For Christmas" by blink 182 (This is when they were still good, and before they sucked)
"Little Saint Nick" by Sugar Ray
"The Christmas Song" by Weezer
"Dig That Crazy Santa Claus" and "Hey Santa!" by Brian Setzer
"Merry Christmas (I Don't Want To Fight Tonight)" by The Ramones (I also play this one even when it's not Christmas)
"The Joy Of Christmas", "It's Christmas (All Over The World)" and "Singing Merry Christmas" by New Edition
and these ones by the Trans-Siberian Orchestra:
First Snow
This Christmas Day
Faith Noel
Wizards In Winter
Queen Of The Winter Night
For The Sake Of Our Brother
Wish Liszt (Toy Shop Madness)
Back To A Reason (Part II)
What Child Is This?
Christmas Canon Rock
Marian Gold should do a Christmas song. A good title for it would be "Christmas in Berlin". And Night Ranger should do a whole Christmas CD.