By place
Scorecard.org allows you to see environmental hazards by maps or Zip code ****
Mapcruzin by Slug Mike Meuser ***
Currently mostly San Franciso Bay Area content
Environmental maps Lots of resources here
eNature allows you to identify, track and report wildlife in your area
Care2 gives various kinds of eco and demographic info based on geography
UCSC Atlas of Global Inequality ****
Wind Map tells where it's feasible to use it as a power source
Worldmapper ***
UN map of Africa showing effects of Global Warming. Atlas
Google Earth
UCSC Ecology Dept is using Google Earth to map research on Bristlecone Pine.
Google Earth map of endangered species
UN Google Earth maps of global climate change and its effects
Google Earth maps of Appalachian mountaintop removal in coal mining