You haven't seen much discussion of Oliver Williamson here so far. But Williamson is a great choice. The main reason I haven't talked about him is because I knew that Peter Klein would write something excellent on Williamson, and he has. Peter was Williamson's PhD student and one of his papers was actually referenced in the scientific background that the Nobel Prize committee provided in announcing Williamson's selection. For more discussion on Williamson see Peter's excellent blog Organizations and Markets.