A cool link that's pretty hidden on the USGS site is Earth Explorer: http://earthexplorer.usgs.gov/ http://earthexplorer.usgs.gov/ It's an agglomeration of mo

A cool link that's pretty hidden on the USGS site is Earth Explorer: http://earthexplorer.usgs.gov/ http://earthexplorer.usgs.gov/ It's an agglomeration of most maps that are available -- you can pick the area, and then see a giant list of the types of maps that cover those coordinates. From topo maps to high resolution aerial photographs, to solar irradiance, to rainfall -- all types of interesting materials.