Featured at the American Geophysical Union conference today...
Originally Posted by NASA
We've seen composite imagery like this before, but certainly not at this level of detail (acquired over 312 satellite orbits, processing 2.5 terabytes of data).
The full set of images and a complete interactive map are available at: The Black Marble
Edited to add: this backup link for Goddard's Flickr image gallery, since the Earth Observatory site is either having issues or inundated with traffic at the moment.