I've sampled my fair share so far. For a non-craft brew the Sierra Nevada Celebration Ale is surprisingly good, methinks. Bitter, cinnamon-y and orange peel. Hops. Not bad.
Okay, of the craft brews, one that stands out as a sorta "kitchen sink" ale is Marin County Brewing Co's Hoppy Holiday Flavored Ale. Others may like it, but it was just too over the hill for me, and I think of myself as pretty daring. Heavy nutmeg tone, tempered with cinnamon (what winter seasonal isn't? cinnamon-y that is...), and orange peel. And the bottle sez it also contains "pure vanilla extract" and "mace", this last I don't think I could identify in a blind smell test. It sounds vaguely menacing though. The whole bomber (7.0% ABV) reminded me of my grandma's xmas cake: just a tad too liberal with the spice cabinet. Decent malt backbone but foam and lace almost nonexistent. Interesting? Yes. Will I drink another? Probably not. But I admire the mad brewmeister 'tude behind it.