I’m not affiliated with this conference, but I’ve heard good things about it. Here’s the announcement:
3rd Annual Conference of the Society for Ethical Theory and Political Philosophy, Northwestern University
April 23–25, 2009
Keynote speakers: Samuel Scheffler and Seana Shiffrin
Conference website (with Call for papers): http://www.philosophy.northwestern.edu/conferences/moralpolitical/ 
We invite submissions from both faculty and graduate students. Essays in all areas of ethical theory and political philosophy will be considered, although some priority will be given to essays that take up themes from the works of Samuel Scheffler and Seana Shiffrin. The submission deadline is February 15, 2009.