Just read a great article from Grassroots Mapping about a public participation GIS project recently conducted for the Cantagallos community in Lima, Peru. To help the community bolster their land claims to the territory they've settled, Grassroots Mapping led an aerial photography gathering mission using helium balloons and a camera. Since the Google Maps / Earth imagery for the region was a few years old and didn't show recent changes to the environment, the detailed up-to-date aerial photography provided a more accurate base map for future public participation mapping efforts!
The article discusses the difficulties in other countries of collectiong geodata or making cartographic development while noting Philippine Association for Inter-Cultural Development (PAFID) activities.
This interesting discusses the community and local uses for 3D modeling and elevation relief models. The article contains a section below for easy reference of what different apspects can benefit from P3DM.