Advertising Blogs?

Our traffic has been quite good, but we always want more. And since we get a modest income from our advertising, we were wondering whether it might be good to put some of that into advertising our blog. The trouble is that we have no idea whether and under what circumstances such blog advertising works (at least when the product being advertised is itself a blog).

If any of you have personal experiences -- positive or negative -- with such advertising, or have other data on the subject, we'd love to hear from you. Please feel free to either post in the comments, or e-mail me at volokh at Thanks!