[youtube=http://www.youtube.com/watch?v=L9C7Y1m7MvM] This draft video was presented at "Changing the change" conference in Torino, July 2008. It focuses on the question:
How people with low employment capibilities organize a service to connect workers in urban central areas with their favourite food?
The visualisation is very detailed and conveys 'scenarios' well. It is also a nice example of a system and interaction diagram.
Although, I think the message would be easier to grasp with less text and complimentary audio...
I particularly liked "A working day of the delivery man."
Check out one of the creators Nico Morrelli blog.