nationally - http://hackforchange.org
I stuck in a core and simple idea around helping "community sparks"
(those people on your block who connect people) create simple neighbor
directories. That might be what you can stand up at a single
hack-a-thon.
See:
http://hackformn.org/idea/code-neighbors-simple-neighbor-directory-app
http://bitly.com/codeforneighbors
As this online group is a landing place for open source neighbor
connecting, I am directing people to land here.
Cheers,
Steve
Steven Clift - http://stevenclift.com
Executive Director - http://E-Democracy.org
Twitter: http://twitter.com/democracy
Tel/Text: +1.612.234.7072