I've already posted about my love for Sierra Nevada's Celebration Ale, here's a list from Bullz-eye.com (that Z makes it EXTREME) showing a few more that are really great. Celebration Ale isn't for everybody and thats ok (its pretty hoppy). But Corsendonk Christmas Ale is wifey's favorite seasonal beer.
Get out and TRY THESE!
Source -> http://www.bullz-eye.com/beer/reviews/2010/top_5_holiday_beers.htm