[Updated 16 March 2009: Broken link. Strawson has a new home page here; but the link to his paper below is unfortunately gone. A revised version of the paper with commentary and Strawson's replies are collected in this book (actually a special edition of the Journal of Consciousness Studies.]
Hat tip goes to this post by Justin. Galen Strawson's new paper persuasively makes the straightforward argument:
1. Experience is a fundamental part of the world.
2. Emergence of experience from wholly non-experiential parts is incoherent.
3. From 1 and 2, panexperientialism is entailed.
Better yet, he does this an a very entertaining style -- sort of like your grouchy uncle who has run out of patience with impertinent nonsense (if said uncle was also an excellent philosopher).