Why not assuage those post-holiday blues with chocolate? It's cheaper than compulsive shopping. Christopher Kimball's America's Test Kitchen Blog has a recipe for Triple-Chocolate Mousse Cake.
Chocoholics have a friend in me.
Update 4/10/10: We hate dead links around here, so I must inform you that the blackguard Christopher Kimball removed the recipe from his blog. He doesn't like it when you get things for free. But I still love you, CK. Please email me if you want the recipe.