Aleks has been talking recently about PMOG, a way of playing an online game passively.
In the same vein, I noticed over the weekend that a lot of people are pointing at MyMiniCity - where players create a SimCity-like place which develops from hicksville to metropolis as you refer more traffic to it.
It's French in origin, and ends up being half game, half traffic visualisation engine. As I write, some of the leading cities are springing from less than savoury sources, and I don't know what kind of lifespan it will have... but for now the combination of competition and Simmish graphics seem to be buzzing.