Clickz has a good article on the size of the Blogosphere which continues to grow.
‘The size of the blogosphere has doubled every five months over the last year and a half, according to blog analysis firm Technorati. Over that time, blogs have gone from being a word that sounded insulting to an online trend embraced even by a sexagenarian Massachusetts senator running for president. Given the frenetic pace of that growth, data charting the blog phenomenon have been vigorously consumed, and in some cases contradictory….
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.’
Read more at The Blogosphere By the Numbers