From the IMM (Interactive Media Manager) blog comes a post on how they made the screenshot above here possible.. here are some snippets to attract you to their post and become as enthusiastic about it as I am :)
we aren’t using a list to store our data. Instead what we decided to do with IMM is to store all of our metadata in Resource Description Framework (RDF). RDF is a specification outlined by the W3C at http://www.w3.org/RDF/. Since RDF by itself can be a very unstructured way of describing things a Web Ontology Language (OWL) (http://www.w3.org/2004/OWL/) was created by the W3C to create a vocabulary so that things could be described consistently and related to each other. In this article I don't want to go into all of the details on why we chose RDF over using a SharePoint list or something else. This is saved for another day.
As I mentioned earlier the data is stored in an RDF store that we have running outside of SharePoint. In order to get to this data we use SPARQL queries. SPARQL is a W3C specification (http://www.w3.org/TR/rdf-sparql-query/) that specifies how to query RDF data. For the media library these queries are stored in the Data Source section of the template XML file.
The syntax for these queries appears to be similar to SQL but that is as far as it goes. The similarity is truly only skin deep. Does this make it a shallow language? Not really as SPARQL is only able to do perform SELECT queries but it provides a lot of power around it.
In case you wondering what IMM is, it's a solution developed by Microsoft for media and entertainment companies which use SharePoint for their collaboration environment.