Celebration is a great beer. Southern Tier has a 2XMAS that I'd like to try. Also, Sam Adams Winter Lager and Red Hook Winter Hook are both decent cold weather brews. I'd love to try Great Lakes Christmas Ale, but they do not distribute in our area (that I know of)
Bells Christmas, Great Lakes Christmas, Schlafly Christmas....they are all over the place now or soon. I prefer the Belgian takes, though: Gouden Carolous, St. Bernardus (though, I never seen them around here in Lexington), Delirium Noel. Nogne O does a nice winter beer, God Jul. Of course, it would be nice to see the other side represented here in Kentucky as well, but alas, no HeBrew Sweet 16 for us: http://thewineandcheeseplace.blogspot.com/2012/11/16-hops-16-malts-and-16-abv.html
I saw cases of St. Bernardus Christmas Ale at Jungle Jim's in Fairfield, OH yesterday. (And bought one.) Odd that St. Bernardus never comes to Lexington.
I have lots of favorites especially since it's been sub 40*. Trader Joes Vintage is always one I look forward too.