Keep our Town Clean
I stumbled across the following grassroots effort to organize a town-wide trash pick-up effort.
The concept is simple, yet the organizers have leveraged many social media tools using Google maps to create help organize. I particularly like the ability to "claim" a site for pickup and how the site then tracks the progress of the effort.
I have absolutely no affiliation with the site or the organizers, but I love the concept and think any group looking for local volunteer efforts may have found a good match!