Steven J. Miller is a Senior Lecturer at the School of Information Studies (University of Wisconsin). Perhaps you’ve heard of him. He gives a number of presentations and has published a number of articles on metadata and cataloging. I happen to know him from an online course on Dublin Core that I took about a year ago now. His main page (https://pantherfile.uwm.edu/mll/www/) has a lot of information about Steven. However, I was drawn to this page because of his “Resources for Metadata and Cataloging Online Resources“.
This is one of the numerous webpages out there where metadata librarians or librarians who need information on metadata can go. Steven’s resource page presents a variety of resources and links to other resources on metadata, repositories, or digital collections. It’s also a page that was last updated November 2010, and is still current today. It’s definitely something to bookmark.