Libraries Unlimited has released Using the Open Archives Initiative Protocol for Metadata Harvesting by Timothy W. Cole and Muriel Foulonneau.
Here’s an excerpt from the publisher’s description:
Through a series of case studies, Cole and Foulonneau guide the reader through the process of conceiving, implementing and maintaining an OAI-compliant repository. Its applicability to both institutional archives and discipline based aggregators are covered, with equal attention paid to the technical and organizational aspects of creating and maintaining such repositories.