State of the Blogosphere

In case you missed it, David Sifry from Technorati has put together a great "State of the Blogosphere" report. Part I covers the size of the blogosphere (4M blogs). Part II notes that a new blog post goes up every 4.6 seconds. Part III looks at the level of authority and influence that various blogs are attaining, and compare that with many traditional media sites. And Part IV sizes up the corporate blogging market and Sun and Microsoft's influence. This (from Part III) is perhaps the most fascinating chart in entire package for PR pros...