Need someone to decide that playing market maker would be fun.
Between BitFunder btct.co and MPEX I am sure one could find some good arbitrage opportunities.
One point I forget to mention : I do trades free of charge. You can trade your S.DICE for GSDPT or your GSDPT for S.DICE 1:1. I also offer to liquidate the bond on MPex for a 1:1 trade between the amount liquidated by selling the bond and the amount you will receive.