The NASA website hosts a large number of images from the Soviet/Russian space agency, and other non-American space agencies. These are not necessarily in the public domain.
The SOHO (ESA & NASA) joint project implies that all materials created by its probe are copyrighted and require permission for commercial non-educational use. [2]
(Satellite photograph by a NASA "Earth Observatory" satellite explicity released in public domain, taken from [http://earthobservatory.nasa.gov/NaturalHazards/shownh.php3?img_id=13881 here] as detailed in Earth Observatory's [http://earthobservatory.nasa.g)
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