Hooray! WordPress.com is about to celebrate its millionth free blog. What’s the secret? Robert Scoble says

It’s audience per blog is much higher than Microsoft’s Live Spaces, for instance. The audience that hangs out on WordPress is a lot more engaged, too, and I believe that blogs on WordPress.com get more than their fair share of Google traffic. Matt told me that more than half of the traffic that comes to WordPress.com comes from Google — the HTML is automatically SEO’d (optimized for search engines).