Tim Burton's: The Nightmare Before Christmas (Special Edition)
"What's This!" and Danny Elfman's instrumentals completely embodies the whimsical wonder of Christmas for me. This Special edition was just released this year with remastered tracks and a second disc of covers by various artists! It even serves double-duty at Halloween too.
This soundtracks is one of my all-time favorites. It's guaranteed to put me in a good mood. Danny Elfman's songs are great, they fit the action perfectly, don't seem forced in, and are really terribly catchy. The special edition has other artists covering some of the more major songs. Personally, I think Fionna Apple's "Sally's Song" is the one that's really worth the money, but Marylin Manson, Fall Out Boy, She Wants Revenge, and Panic! at the Disco.