Some thoughts on the Silence of the Blogs thread going around the Online news list:

1) Blogging offers a cheap and flexible publishing platform to both the curious, and the committed, just as web page software and desktop publishing software did in earlier years.

2) Since there are more than 2MM people blogging--and we're talking active users here, of Blogger.com, Userland, Typepad, and other hosted services that blogcount actively tracks--there are many types of bloggers.

I'd say Persus is only offering data, not interpetation, and that the sample, while interesting, is a bit squewed (as research studies often end up being.