Abstract. In this paper we present a newly designed annotation and collaboration component, which has been prototypically implemented on top of an ERP (Enterprise Resource Planning) system. Standard ERP software is often described as being inflexible in respect to personal needs of a single user or a user group. To cope with this problem, theories, and principles from classical CSCW research and design were combined with recent developments in Social Software and what is now often summarized as Web 2.0. Our component is inspired by Web 2.0 principles like user generated content, information sharing, and harnessing network effects. As the central paradigm we applied social tagging based on folksonomies as e.g. used in del.ico.us, Flickr, and YouTube. In addition best practices from research on online community building were used to design a social annotating component for ERP systems.