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Earth from a different perspective
The purpose of the site is to provide a consistently updated, central point of access to the superset of Nasa?s Earth science-related images, animations, and data visualisations. These images are considered to be public domain and, as such, are freely available to the interested public-at-large, the media, scientists, and educators for re-use and/or re-publication. There are currently 5079 records in the database (41.6GB).
This site is really impressive. The above link is to an article about the site. But you can find the actual site here:Visible Earth - a searchable directory of images, visualization, and animations of the Earth. Really amazing!