I'm still waiting on "I Believe in Father Christmas" by Greg Lake, and time is running out. I also haven't heard "Snoopy's Christmas" but I often miss that one. Last year I heard Pearl Jam's Christmas song a bunch of times but the same station hasn't played it once this year that I've heard. I also heard a Christmas song by Better Than Ezra for the first time two years ago but haven't heard that since on that same station.
Also absent this year have been Jim Croce, Dan Fogelberg, and U2. Lost to the ages are "One Christmas Catalog" by Captain Sensible and "She Won't Be Home" by Erasure. I did hear Kate Bush's Christmas song "December Will Be Magic Again" this year for only the second time ever.
Covered for the season: The Waitresses, XTC, The Pogues, Pretenders.