William Lane Craig (“Yes”) and Shelly Kagan (“No”) debated the question. There is a link to their debate and a good, on-going discussion of it over on Prosblogion. The blog’s discussion is really quite impressive; my experience is that very often, after the first eight posts or so, comments on blogs usually lose track of the topic or become childishly snippy. (Not on any of my blogs, of course!) But this one maintains a decent level of focus and civility.