Continuing with my series polling the readership, we turn now to theoretical ethics, broadly construed, but excluding bioethics, business ethics, environmental ethics, and the like.  (I also want to exclude metaethics proper, i.e., work on the semantics and metaphysics of morality and value, but I realize that border can be fuzzy.) As before, the answers are a bit caricatured, choose the one closest to your view, even if you'd express it differently.