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

Map tells where it's feasible to use it as a power source