The Columbia Journalism Review has an interesting article on the history of Weblogs. "The growing power of Weblogs, or "blogs," has hardly gone unnoticed" is the starting sentence.
To show you how fast things have changed, the article points out that Pitas was the first blogging software which was developed by Andrew Smales and went online in 1999. The blogosphere has gone from dozens to millions in a very, very short time.