Readers have been asking for awhile that I run some more "hot topics" threads, like the earlier ones on ethics and epistemology. I apologize for not running these more frequently, and will plan on running more of these in 2009. So what are some of the hot topics in "metaphysics"? The specialty as a whole seems to be thriving (much to the distress of Quineans and retrograde positivists!). All the classic topics (time, persistence, identity et al.) seem to have received significant recent discussion, and the metaphysics of causation also seems to have returned to center stage in the last ten years. Post your comments, below, and the more detail the better. Also feel free to post links to on-line resources (papers, blog discussions, etc.). Post only once; comments may take awhile to appear.