3 layer chocolate mousse cake (ATK recipe). I made a few adjustments, most notable are making half a batch in a rectangular shape. Second was adding coffee and vanilla to the otherwise plain white chocolate layer, giving it a much more interesting flavor (and coffee-vanilla is one of my favorite combos to begin with). The bottom is a brownie layer, as per the recipe.
I highly recommend this recipe.
I should've thought of moving the cake to nicer plate before taking a picture...