Howard Kurtz takes up the topic in today's WaPo, where he quotes me, and makes a special appeal to women bloggers to email him "when they have a posting on media or politics that they'd like to see picked up."
Maybe women don't send out as much self-promoting email as men do. We should!
Anyway, I wouldn't be surprised if there are many more female bloggers than males, even though males greatly outnumber females at the top of the traffic/links charts. People blog for different reasons and in different styles. And people read blogs in different ways: it may be that readers who want political opinion have a greater tendency to converge on the conspicuous top blogs, but readers who want quirky anecdotes, wise insights, and cultural commentary may spread out over a much larger number of blogs.