Here’s an album called Santastic! that is a collection of 18 mashups of holiday songs. I’m listening to the album for the first time right now so can’t give it a complete review but track 2 “The Christmas Massacre of Charlie Brown”, is noteworthy and fun.
Besides, the thing is free and your mp3 player is just begging for some more Christmas music.
I’m thinking this is really good stuff to have an your Christmas party (although a couple of the songs are tagged NSFW so you might need to be a bit selective depending on your audience) since it’ll be familiar enough for people to recognize the tunes as holiday oriented but with enough of a twist that’ll get your recognized as being on the culteral cutting edge!