I'm kinda partial to this one, chiefly because I can sing along with reading the music. My church choir does this one after Communion every Christmas Eve. They invite people in attendance to come up and sing with them.
[youtube=425,350]http://www.youtube.com/watch?v=7YaGwI7GjlA[/youtube]
Though, to have been part of this, I would have gladly given a(t least one) body part.
[youtube=425,350]http://www.youtube.com/watch?v=wp_RHnQ-jgU[/youtube]
Brings tears to my eyes watching it--every time.