Sifry's Blogging report

I believe Sifry's report about the state of blogging is right now the most accurant proximity to get about an idea how many blogs are out there. After a report in August and the one before in March, Sifry published yet another report yesterday.
The summary:

• As of October 2005, Technorati is now tracking 19.6 Million weblogs
• The total number of weblogs tracked continues to double about every 5 months
• The blogosphere is now over 30 times as big as it was 3 years ago, with no signs of letup in growth
• About 70,000 new weblogs are created every day
• About a new weblog is created each second
• 2% - 8% of new weblogs per day are fake or spam weblogs
• Between 700,000 and 1.3 Million posts are made each day
• About 33,000 posts are created per hour, or 9.2 posts per second
• An additional 5.8% of posts (or about 50,000 posts/day) seen each day are from spam or fake blogs, on average

I already need to update my thesis again - incredible how fast it's changing. Absolutely great would be an overview of the different kind of blogs - I don't think that the current categorizations (which I also use in my thesis) are accurate anymore due to the fast changing of the blogosphere...anybody out there keen to make a thesis about it?