Remote Sensing and GIS Web Sites

http://remotesensing.usgs.gov/
http://earthobservatory.nasa.gov/Features/RemoteSensing/
http://www.oregongeology.org/sub/projects/olc/
Free GIS and remote sensing image processing system SPRING
Free and open source GIS software.
Free software ILWIS
http://www.openstreetmap.org/
DETER is a system for real-time detection of deforestation in Amazonia
http://www.qgis.org/en/site/
INEGI (Spanish)