Thanks Doug. You might want to take a look at the state hiding and grouping feature in the exploration result viewer (click the Manage Views button when you are seeing an exploration, create a new view and use the GroupQuery and HideQuery fields).
We use MSAGL, which is a fairly powerful engine, and would allow us to change the graph appearance in many ways. What would you suggest? Using rectangles instead of ellipses and diamonds for states? Anything else?