If you don't know already, Philosopher's Digest is an excellent new philosophical resource. As the site's title suggests, philosophers write short but careful summaries of recent articles of note in their respective areas of specialization (including philosophy of religion), and offer worries or criticisms of their arguments to indicate their strengths and weaknesses.
Recently at PD, John Milliken posted a digest of Erik Wielenberg's recent paper, “In Defense of Non-Natural, Non-Theistic Moral Realism” (Faith and Philosophy 26:1 (January 2009), pp. 23-41). The paper argues that moral truths are necessary truths, and that moral facts are non-natural facts (which is my own view, for what it's worth). He further argues that the criticisms of Wainwright, Moreland, and Craig to this sort of view would, if cogent, apply with equal force to their own, theistic accounts of ethics.