I like "Do They Know It's Christmas." The stuff I've been listening to most in terms of Christmas music is Sufjan Stevens' "Songs for Christmas" box set. I don't tend to dig on most of the Christmas music I hear outside of my iTunes, but mostly because what I hear is what my parents play, and my parents play Raffi and the Alabama Christmas album.
And I have a CD by Dr. Elmo, the guy who did "Grandma Got Run Over By a Reindeer." It has the sequels, "Grandpas Gonna Sue the Pants off Santa" and "Please Don't Make Me Play That Grandma Song Again."