I’ve been working with RDF Gateway from Intellidimension in our solution development for the last couple of years and today they dropped what I believe is a significant enhancement in performance to their already fantastic Semantics.Server solution for storing and retrieving RDF triples in SQL Server 2008.  Also new in this release is an update to the SDK that provides an Entity framework on top of the existing SDK.  The new Entity framework simplifies the way you work with business entities in your semantic applications. I’ll try to put a longer post together later that show how these technologies are used.