Courtesy of Smart Mobs.
According to David Sifry, Technorati 's chief executive, the current number of blogs is now over 8 times bigger than the 500,000 blogs it measured in June, 2003.
The company tracked 3 million blogs as of the first week of July, and has added over 1 million blogs to its stable since then. Meanwhile, Pew Internet & American Life reports a new weblog is created every 5.8 seconds. That roughly translates into 15,000 new blogs every day.
Check out the article for links, including this one showing a graph of weblog posts per day.
Smart Mobs: The Blogosphere By the Numbers