Information today is often distributed among many different system within a complex IT environment. Using this information for creating knowledge organization systems and services thus involves using this distributed information and re-purposing it within new applications. The current trend in Web technologies to build systems not in a monolithic fashion, but rather intended as building blocks within a constantly evolving and unplanned landscape of information processing agents. This approach can be used as a foundation for building Knowledge Organization Mashups. We investigate the possibilities and challenges of this type of application, and as a case study describe a service for managing bibliographic metadata.