Earlier today, Google announced that Google Earth has been downloaded one billion times since it was released in 2005. This number, which includes desktop clients, mobile apps, and the Google Earth plug in, makes Google Earth one of the most downloaded applications of all time. To emphasize the enormity of the number one billion, the post pointed out that a billion hours ago humans were still living in the Stone Age and a billion minutes ago the Roman Empire was the dominant world power.

Google Earth and Maps vice president of engineering Brian McClendon said the following of the one billion downloads achievement:

via Google Earth Reaches One Billion Downloads | Search Engine Journal.