Metadata Resources

Cedars Guide to Preservation Metadata provides some background on preservation metadata for those interested in digital preservation (March 2002, from CURL, "a consortium of the top research-led institutions in the UK and Ireland")
Data Dictionary for Preservation Metadata (May 2005, final report of the PREMIS Working Group)
Digital Libraries: Metadata Resources (IFLA resource)
Dublin Core Metadata Initiative is an open organization engaged in the development of interoperable online metadata standards that support a broad range of purposes and business models
EAD: Encoded Archival Description (version 2002 official site)
Future Directions in Metadata Remediation for Metadata Aggregators (Digital Library Federation, Feb. 2009)
METS: Metadata Encoding & Transmission Standard - standard for encoding descriptive, administrative, and structural metadata regarding objects within a digital library, expressed using the XML schema language of the World Wide Web Consortium
National Science Digital Library, NSDL Wiki: Collections and Metadata
Open Archives Initiative - develops and promotes interoperability standards that aim to facilitate the efficient dissemination of content.
PADI (National Library of Australia) - Preservation Metadata (bibliography of preservation metadata resources)
Preservation Metadata and the OAIS Information Model (2002 report)
PREMIS Data Dictionary for Preservation Metadata, v2.0 (March 2008)
PREMIS (PREservation Metadata: Implementation Strategies) Working Group (international group, sponsored by OCLC and RLG)
Reference Model for an Open Archival Information System (OAIS)