Metadata at W3C 
W3C's metadata activity information page. Contains links to news, events and publications, as well as project groups, recommended reading, and related W3C activities.
Metadata indices and HTML interface
This paper discusses the utility of relational database-based metadata catalogs in keeping track of astronomical and geophysical observations, the use of WWW servers and client forms to allow access to the catalogs, graphical interfaces, and a proposal for a distributed system of databases serving the entire astronomical and geophysical community.
Metadata standards directory
This sites hosts a collection of links to geographic data, metadata and interchange standards, metadata standards and resources, multilingual tools and services, and links to Web sites containing geographic information.
Yahoo!'s Metadata page
Yahoo!s directory of Metadata.
