The journal (JCS) that published Chalmers' article on the singularity will be devoting an entire issue in January 2012 to responses to Chalmers' article. Authors who have agreed to contribute so far include big names like Ned Block, Paul Churchland, Dan Dennett, Jesse Prinz, Drew McDermott, and Robert Sawyer. (Also, Kevin Kelly and Ray Kurzweil.)
JCS is also accepting submissions. See the last page of this PDF.