WebProNews reports that Roger L. Simon, in an "Open Letter to All Bloggers," has announced a network to sell ads on blogs: "trying to turn blogs into a business…with the intention of working in two areas - aggregating blogs to increase corporate advertising and creating our own professional news service." AdJab writes that the organizers include Little Green Footballs' Charles Johnson and Winds of Change's Marc Danziger. The venture will apparently be called Pajamas Media and is looking for sites to join up as a way to sell cross-blog ads.