Dare Obasanjo posted some skepticism about the Technorati blog counts, partly because of this:

As usual for this series of posts, Dave Sifry plays fast and lose with language by interchangeably using blogosphere and number of blogs Technorati is tracking . There is a big difference between the two but unfortunately many people seem to fail at critical thinking and repeat Technorati's numbers as gospel. It's now general knowledge that services like MySpace and MSN Spaces have more blogs/users than Technorati tracks overall.

It seems he might have spoken too soon - looks like the Technorati Top 100 is tracking Spaces on MSN, at least. It looks like a lot of the "first movers" in the blog sapce are being pushed down (or even off) the top 100 list by personal blogs of various sorts. As Publishing 2.0 says:

There are many implications to this phenomenon, all of them fascinating and deeply disruptive to U.S. West Cost-centric view of the blogosphere

The blogosphere is not one thing, and never was. And the divide is bigger than politiacl/other. It's really a huge set of partially (and non) overlapping niche audiences of various sizes. Just as cable TV has allowed for a more diverse range if special interest channels, the unlimited nature of web space has enabled a nearly infinite diversity of conversations.