Microsoft wants you to know:
Today, the Bing Maps team announces the completion of its ambitious mapping effort, Global Ortho Project, for the United States. In two years, the Bing Maps Imagery team has collected every square inch of the continental US and Western Europe at 30cm resolution (1ft = 1 pixel). This endeavor sets a new standard in aerial map imagery.
To give you an idea of the amount of imagery the team has taken, at 30cm per pixel, you could line up all the Global Ortho pixels end-to-end to reach around the earth 994 times, to the moon 104 times and to Venus with an extra seven trillion pixels to spare.
Check out the Bing Maps blog post for more information.