Hey, thanks for the compliment! No, I hadn't considered mutualism, actually; now that you bring it up, it does sound like a great idea for a future essay. I'll add it to our list, though I think both of us will have to do a little reading on it. (I don't think either of us have read that body of literature). What we are considering, and are maintaining on the list:
-Consequentialist vs. Deontological
-For Political Anarchism
-A Libertarian Theory of Enfranchisement
-Liberty and Tradition
-A Rothbardian Abortion Theory (though this would be solo, Cardosi as a pro-lifer disagrees with my unique stance based on the original Rothbardian theory)
-How Would ___ Work in an Anarchist Society
-Mutualism Disproved (thanks to Derick's suggestion)
All that said, I'm glad you enjoyed the essay. One of our next essays we may want to try to get published here, on DA.
As far as pragmatarianism goes, Xerographica wrote a "rebuttal" to our arguments:
http://pragmatarianism.blogspot.com/2012/03/pragmatarianism-disproved.html