Christmas Ales list update (yes, it's post Xmas, but you should still look for these fine holiday beers):
Gouden Carolus Noel - Belgian Strong Dark, 10.5% ABV, reviewed at The Brew Club
St. Bernardus Christmas Ale - Belgian Strong Dark, 10% ABV, reviewed at The Beer Brotha
Anchor Christmas Ale - new recipe every year for over 30 years now.
Delirium Noel - Belgian Strong Dark, 10% ABV
Corsendonk Christmas Ale - Belgian Strong Dark, 8.5% ABV, given an A+ by the Alstrom Bros on Beer Advocate, founders of the largest database of beer reviews and two of the biggest beer drinkers since Michael Jackson (no, not that Michael Jackson, this one)