I love She & Him, the collaboration between Manic Pixie Dream Girl Zooey Deschanel and Manic Hipster Dream Guitarist M. Ward. The fact that they did a Christmas album together is awesome, and the fact that the album itself is a favorite of mine for Christmas songs overall doesn't hurt, either.
Source:
http://www.fruitlesspursuits.com/2012/12/25-days-of-25-christmas-songs-day-20.html