Check out these comprehensive wikis created by the Dublin Core Metadata Initiative. The User Guide provides an in-depth overview of Dublin Core and linked data.
Creating Metadata continues the saga, going into detail about the process of producing resources, properties and values for each DC element. The tables and examples are invaluable.
Finally, Publishing Metadata explains how to properly utilize DCMI metadata as linked data, code and all.
Going beyond the information available on the main Dublin Core website, this series of wikis really gets to the core of Dublin Core.