Pingdom has published some interesting statistics regarding the use of different blogging platforms and technologies within the Technorati top 100. There are interesting not just due to the basic distributional data (Wordpress accounts for 27 of the top 100, MT for 8, Typepad for 16, Blogger for 3) but also in what the report reveals about how Technorati computes the top 100. For example, Weblogs, Inc. accounts for 14 of the top 100, Wired for 9 and Gawker for 9. I'd be interested in looking at the sister linking between sites in these networks.
Another part of this signal is to do with comment spam. The more popular the blog, the more important it is that the authors have control over spam.