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


Al