This past summer, I helped three park groups place community public art in their parks. A few neighbors near one of the parks had concerns about homeless people sleeping in/near the sculpture, and it became necessary for us to generate and document overwhelming community support to obtain the required city permits.

I used Google Maps to see where the neighbors actually lived in relation to the proposed site, typing in each of hundreds of addresses by hand using the Google Maps "My Maps" feature. Recently, some awesome Google maps have been created about the So Cal fires.

Where o where is the app that imports a spreadsheet of addresses, lets you choose the markers and visually illustrates community support?

There must be a better solution. Has somebody already hacked this? Am I missing a wicked awesome mashup? I've found workarounds for Google Earth, but none for Google Maps.