The Northern Institute of Philosophy has a great series of discussions of philosophical puzzles. Each "episode" is fewer than ten minutes and involves a clear presentation of the puzzle and a discussion of some of the more popular attempts at solving it.
Those of you in my Metaphysics and Epistemology course should check out the one on skepticism (toward the bottom of the page). Below each episode are a few links to research related to the topic. A friend of mine from graduate school, Dylan Dodd, has some of his work linked under the skepticism episode. He's a careful philosopher and you might enjoy reading some of his work.