I've been working on the Sonoma Wiki Project, focusing on Sonoma Valley where we have several unincorporated communities. I've been trying to figure out a good way, other than creating polygons in Google Earth, that we an have a collaborative map of the "border" of each of the villages.

As far as I can tell, this interface is not available in OpenStreetMap but it would be nice. If anyone has an suggestions, I'd love to hear them.

http://www.sonomavalleywiki.org/