Astronaut Photos of Earth
http://eol.jsc.nasa.gov

Current Weather: Real Time Data
http://ww2010.atmos.uiuc.edu/(Gh)/wx/home.rxml

Earth Science Picture of the Day
http://epod.usra.edu

EarthKam
http://www.earthkam.ucsd.edu
Photographs of our Planet taken from the Space Shuttle
and International Space Station.
Geomorphology from Space: A
Global Overview of Regional Landforms
http://daac.gsfc.nasa.gov/DAAC_DOCS/
geomorphology/GEO_HOME_PAGE.html

JPL's El Niņo Watch
http://www.jpl.nasa.gov/elnino

Landsat Imagery
US Geological Survey -- EROS Data Center
http://landsat7.usgs.gov/

NASA Earth Observatory
http://earthobservatory.nasa.gov
Feature articles

NASA's Visible Earth
http://visibleearth.nasa.gov

NOAA Photo Collection
http://www.photolib.noaa.gov

Planet Cam
http://www.discovery.com/cams/planet/planet.html

TOMS Ozone Home Page
http://jwocky.gsfc.nasa.gov