I recently created an Open Green Map charting the Northeast Permaculture and Eco/Urban Agriculture Experimentation Network and successfully promoted it in 3 weeks using social networking tools, such as Facebook and listservs.
Check out this slideshow that details how I did this. It may even give you some ideas on how to create and promote your Open Green Map!
Permaculture Open Green Map
I made this map as part of a Student Green Mapmaking Internship Program that we are running this summer in our NYC office. I am serving as the Education Trainee for this program and several students are creating themed print and open Green Maps of their home neighborhoods.
Check out the Internship Blog to see what sort of projects the other interns are cooking up this summer!
Green Map System, NYC