The "Weblogging Ecosystem" workshop will provide a forum for presentation and discussion of research into the dynamics, sociology, and mining of the blogsphere. Topics of interest to the workshop include: * Mapping and visualization of the blogsphere * Weblog taxonomies: automatic and/or manual construction * Automatic classification of weblog entries * Weblog search engines * Aggregate measures over the blogsphere * Weblog mining and applications * Dynamics of information flow across the blogsphere * Methods for weblog census * Weblog lifecycle * Influence of blogsphere on the information landscape * Alternative blog forms (radioblogs, photoblogs, etc.) * Sociological studies of blogging * Knowledge sharing applications of weblogs A secondary goal of the workshop is to discuss the sharing of weblog datasets for use in research studies.