I am reviewing data about blog authors and blog readers (I don’t just mean aggregate numbers but specific demographic info about them). As far as I know there have been few systematic studies of these questions. The recent data memo by the Pew Internet and American Life Project has some helpful figures as does their earlier report on Content Creation Online (p.5.). Some have collected related data by analyzing blogs. We also have some information from reports by commercial firms. Plus we have some figures from informal surveys conducted online, but unfortunately these are not at all representative. I want to make sure I haven’t missed anything. Please point me to additional sources that come to mind. Thanks.