Resources to assist in creating community-based or citizen mapping. While it goes under several names, it is the capacity for a group of persons who are not associated with a school or government agency to create their own set of spatial information.
American Panorama is an historical atlas of the United States for the twenty-first century. It combines cutting-edge research with innovative interactive mapping techniques, designed to appeal to anyone with an interest in American history or a love of maps.
Crowdmap allows you to set up your own deployment of Ushahidi without having to install it on your own web server. Use it for monitoring elections, mapping crises, curating local resources. They are trying to make it as easy as possible for you here.