John Prine - Christmas in Prison My alltime favorite. If you like John Prine, "A John Prine Christmas" is a great album.
Rock Christmas:
Kinks - Father Christmas Any of the Brian Setzer Orchestra Christmas albums are also a lot of fun, but a bit more traditional.
I bought this for my wife this year, we didn't have it in the collection. If you like motown/R&B this is the Christmas album to own:
A Christmas Gift - Phil Spector