In celebration of the fact that I seem to have managed to get into an iteration of the yuletide debate without making a *total* ass of myself, have some mp3s celebrating the despoiling of Christmas:

Allan Sherman - the 12 Gifts of Christmas.mp3
The odd thing about all the songs in this set is that they're weirdly, deeply dated. (It's a transistor radio! With headphones! How modern!) I mean, it's not like the basic ways of commercializing Christmas have varied that much over the years, but I guess if you're going to mock pop culture you might as well be specific. And from this end of the timeline, the kitsch-nostalgia factor is part of the charm.
Tom Lehrer - A Christmas Carol.mp3
It's Tom Lehrer, and that should be all you need to know. Though I spent a while agonizing over whether to put up the live version, or the studio version. I kept the studio tracks specifically because I thought they might be useful for fanmixes, but the live versions just have so much more charm I can't resist. So this is the live version. But if you have some need for the one without the audience reaction, I can totally hook you up.
Jonathan Coulton - Podsafe Christmas Song.mp3
Oh look, it's another Tom Lehrer for the 21st century, come to save us from ourselves! (And the RIAA.)
Stan Freberg - Green Chri$tma$.mp3
Okay, if "I Heard the Bells" is my favorite traditional carol, this is my favorite novelty track. I have the whole six-and-a-half minute routine memorized, right down to the pauses in the dialogue. Even if I still don't get half the references.
(According to legend, when this track first came out, advertisers and corporations were terrified of it and banned it from commercial radio stations; but within six months of its release Freberg had been hired by Coca-Cola to write them an ad campaign. There's a heartwarming Christmas fable for you!)