With the simple work I have done so far on my Cartographer Unity3D environment - I have been thinking about having the maps as agents of some sort. They could then migrate around the environment and keep from bumping into each other etc. At the moment they are armed only with a wobble script that gives them some life.
Onto Digital Urban though, they are have been looking at these things for some time and have Unity tests going already. 5 Movies on Particles, Agents and Emergent Behaviour is a new blog post which summarised their recent efforts in this area. Using the 'Crowd and Delegate' system in 3ds Max, NetLogo and Unity3D they are exploring traffic, flocking, simulation and more. Love their stuff.
Here is the newest vid - see the post for more: