Annotating is a pervasive element of scholarly practice scholars remain dissatisfied with the options available for annotating digital resources. The overarching goals of this project (consisting of multiple phases) are: To facilitate the emergence of a Web and Resource-centric interoperable annotation environment To demonstrate through implementations an interoperable annotation environment enabled by the interoperability specifications To seed widespread adoption by deploying robust, production-quality applications conformant with the interoperable annotation environment in ubiquitous and specialized services, tools, and content used by scholars -- e.g.: Zotero, AXE, LORE, Co-Annotea, Pliny; JSTOR, AustLit, MONK.