Underused _assets

This file is for listing value that is in the public mein, yet mostly unused or underutilized, compared to what they COULD be doing for the public.

* Public parks
* School athletic fields
* Shopping mall atriums
* Public squares
* Parking garages
* Empty parking lots
* University events
* google groups
* various free web site tools
* hotmail, gmail free email
* google docs for sharing documents and collaboration

Additionally, more contentious:
* Institutional rooftops
* Underground parking garages
* Underground steam tunnels, cable routes, water mains