Try Music K-8
. We don't do Christmas programs in my school, but anything by Teresa Jennings is great! If you haven't become acquainted with the Plank Road materials yet, including the Music K-8 magazine/CD's, the informative home page, the Idea Bank, and the music-teachers' listserve, check it out.
I almost missed your post and only saw it when I checked for "all new posts." There is an ARTS board included as a subheading of the SUBJECTS board. It's not very active, but perhaps music teachers are checking it and just finding nothing to which they can respond.