The document describes the MUD 2010 workshop on mining unstructured data. It provides examples of unstructured data like websites, diagrams, documents, social media, documentation, help files, source code, bug reports, commit logs, emails, and system logs. Unstructured data is characterized as being complex, diverse, and imperfect due to its lack of explicit structure or format and use of natural language, rich semantics, and no authoritative representation.