Partial proof of concept that WordPress can be used for creating, editing and disseminating semantic linked data, in this case using the schema.org vocabulary.
The plugin extends the MetaBox plugin to provide custom post types for some schema.org classes/types and forms using custom metadata fields to add properties for them. The theme is designed to display the data entered with embedded RDFa.
More info at http://blogs.pjjk.net/phil/wordpress-as-a-semantic-web-platform/