Dear Rob Lanphier, I have made the experience that the members of Wikipedia's "Arbitration Committee" (ArbCom) work rather independently and that the one ArbCom member is rarely willing to revert the decision of the other ArbCom member.
Therefore, I suggest that the ArbCom should be elected by a single-winner election method used at large. Markus Schulze ---- Election-methods mailing list - see http://electorama.com/em for list info
