My post-exam baking produced a red wine chocolate cake, following SmittenKitchen's recipe. My cake didn't turn out nearly as reddish as hers apparently was, but it was still very tasty. Plus, the baking process filled the apartment with a pleasant blend of wine and cinnamon.
I think this cake would work well, recipe doubled, as a layer cake. I can also report that the texture and flavor both improve over the course of a few days, becoming more heavily aromatic and also even more moist.