Every year I mention it and this year I actually saw and heard it with my own ears at Blog World Expo. Here is the State of the Blogsphere 2008 by the Technorati folk. What people were talking about when it was done, at least in my circle, was the amount of people blogging for money and how much they were making. Monitizing your blog was quite a dominant theme at Blogworld. Of interest is the following quote from the presentation regarding blogger's income.
"The mean annual revenue is $6,000 with $75K+ in revenue for those with 100,000 or more unique visitors per month."