Offers maps and satellite images for complex or pinpointed regional searches.
http://earth.google.com/

Send me "The Sightseer" - Google Earth's Monthly Highlights, Tips, and Update News
http://earth.google.com/download-earth.html

Earth (pronounced /????/   (help · info)) is the third planet from the Sun. Earth is the largest of the terrestrial planets in the Solar System in diameter, mass and density.
http://en.wikipedia.org/wiki/The_Earth

NASA Earth Observatory: Current information about climate and the environment. ... Feature Articles. Earth Perspectives. In 2008, as NASA celebrated its 50th anniversary, the Earth ...
http://earthobservatory.nasa.gov/

General information, some statistical data and links.
http://www.nineplanets.org/earth.html