This document introduces corporate weblogs and provides a taxonomy. It discusses how weblogs have evolved from personal diaries to organizational uses. The taxonomy classifies corporate weblogs based on their target group (internal employees or external stakeholders) and content (specific facts or general information). Examples of internal weblogs include knowledge weblogs for sharing work-related information and culture weblogs for communicating company values. External weblogs can be used for branding or collaborating with stakeholders.