GeoTIFF, JPG or PNG

GeoTIFF, JPG or PNG

Coverage	Web link
Worldwide	http://www.unearthedoutdoors.net/global_data/true_marble/download
Worldwide satellite map from NASA	http://earthobservatory.nasa.gov/Features/BlueMarble/ with a download mirror at http://mirrors.arsc.edu/nasa/world_500m/	http://neo.sci.gsfc.nasa.gov/Search.html (a lower resolution map)