um.... division and seperation of powers, NGO's, delegated powers (i guess), international law (yes it is not enforcable, but if countries want to look good on a world stage - which they do - they will ratify international law) ummmm our democartic form of government... human rights (again an image thing).... im not sure, just a few ideas. also the social, political, economic and cultural power of a nation state.... the australian constitution... lol thats all i can think of