Here is Wes' recent paper, "Did God Command Genocide? A Challenge to the Biblical Inerrantist", Philosophia Christi 11:1 (2009), pp. 7-26.
This paper really needed to be written.
UPDATE: Paul Copan has written a rejoinder to Morriston's paper. It can be found here. A tip of the hat to TKD for the link. I leave it to the reader to decide whether Copan's reply is adequate.