Technorati, the still-trying-to-redefine-itself blog search and now blog ad network, has bought out Blogcritics, one of the oldest online blog magazines and blog networks. The site publishes contributions from bloggers on everything from music reviews to articles on politics and technology..it was part of the Technorati ad network since June.

The rationale? Says Technorati CEO Richard Jalichandra in his blog post: “Blogcritics brings us closer to an open community of bloggers and the audience that follows them. It also gives us a lot more advertising inventory. What’s in it for them? Our combined resources will help that community grow and expose their work to an even wider audience. We’ll also work more closely with Blogcritics authors so they can monetize their own blogs.”