The brilliant and erudite Belgian libertarian legal theorist Frank Van Dun has a powerful, rich and provocative draft article: Comment on R.P.Murphy’s & Gene Callahan’s Critique of Hans-Hermann Hoppe’s Argumentation Ethics [2]. It's a response to recent criticism [3] of Hans-Hermann Hoppe's argumentation ethics [4].

Van Dun is well-suited to join the fray, having himself written on this topic before, as he explains in his draft comment. For more on Van Dun, see:

• Van Dun, Frank, Economics and the Limits of Value-Free Science [5], Reason Papers 11 (Spring 1986): 24
• Van Dun, Frank, On the Philosophy of Argument and the Logic of Common Morality [6], in Argumentation: Approaches to Theory Formation, E.M. Barth and J.L. Martens, eds. (Amsterdam: John Benjamins, 1982), p. 281
• Hoppe's "argumentation ethics [4]"
• my New Rationalist Directions in Libertarian Rights Theory [7], 12:2 Journal of Libertarian Studies: 313-26 (Fall 1996) (Dutch version Hebben we rechten? Nieuwe rationalistische richtingen in de Libertarische Rechten Theorie [8])
• More materials on discourse ethics [9]

Apparently Van Dun has a wealth of libertarian writing in Dutch; it's high time we have some English translations.

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Update: See the entry Kim Davies on the Transcendental Foundations of Ethics [10].