From the webpage:
We are pleased to announce the publication of the 1.0 release of the Open Annotation Data Model & Ontology. This work is the product of the W3C Open Annotation Community Group jointly founded by the Annotation Ontology and the Open Annotation Collaboration. The OA Community Group will be hosting three public rollout events, U.S. West Coast, U.S. East Coast, and in the U.K. this Spring and early Summer. Implementers, developers, and information managers who attend one of these meetings will learn about the OA Data Model & Ontology firsthand from OA Community implementers and see existing annotation services that have been built using the OA model.
Open Annotation Specification Rollout Dates
U.S. West Coast Rollout – 09 April 2013 at Stanford University
U.S. East Coast Rollout – 06 May 2013 at the University of Maryland
U.K. Rollout – 24 June 2013 at the University of Manchester
No registration fee but RSVP required.
Materials on the Open Annotation Data Model & Ontology (W3C) and other annotation resources.
The collection of Known Annotation Clients is my favorite.