Tyler Wunder is a recent (2007) philosophy PhD from Boston University. His dissertation, Warrant and Religious Epistemology: A Critique of Alvin Plantinga's Warrant Phase, is (as the title gives away) a critique of Plantinga's externalist account of warrant (as explicated and defended in Plantinga's Warranted Christian Belief). I've only read parts so far, but it looks to be very good. A revised chapter from his dissertation is published in the June issue of Religious Studies. It's a critique of Plantinga's argument from the existence of proper function in living things to theism. The article's entitled, "Anti-Naturalism and Proper Function". I've just read it, and I must say that it's a thorough and compelling critique.
I should mention that the current issue of Religious Studies is chock full of excellent articles. See, e.g., the exchange on the argument from religious demographics, the Molinist's reply, and the rejoinder. See also Robert McKim's article, "On Religious Ambiguity". Some fun reading over Christmas Break!