My post yesterday inspired lots of discussion at L&P. See here, here, here, here, and here.
Steven Horwitz posts a full response at L&P as well, "Thoughts on Sciabarra," which has inspired some responses too: here and here. Also see Roderick Long's post on "The Virtue of 'Selfishness'."
Finally, don't forget my newest post, "'Capitalism' and Other Isms," and the discussions that it has inspired here, here, and here.