So my 2,500 words on "Moral Skepticism and Moral Disagreement:  Developing an Argument from Nietzsche" generated some 25,000 words of generally quite interesting and illuminating commentary (moral realists came out in force, as I had hoped!), to which I am, indeed, working on a response–apologies for the delay.  But in the interim, readers might enjoy an interesting short piece in the same forum by my Chicago colleague Robert Pippin asking the important question what it could mean to acknowledge from the first-person point of view the implications of skeptical accounts about agency, like Nietzsche's.