Benjamin Heitmann and Eyal Oren have just announced the 1.0 release of ActiveRDF:

ActiveRDF is a library for accessing RDF data from Ruby programs. ActiveRDF gives you a domain specific language for your RDF model and provides object-oriented access to your RDF resources, classes, properties, etc. ActiveRDF conforms to the RDFS specification (multiple inheritance, multiple class membership, etc.)

ActiveRDF can be used as data layer in Ruby-on-Rails, similar to ActiveRecord. ActiveRDF with Ruby-on-Rails puts the semantic web on rails, and allows you to create semantic web applications rapidly.

With ActiveRDF you can access various sources of RDF data. We support SPARQL endpoints, Redland and RDFLite; (native) adapters for Jena, Sesame2 and YARS are in development.

I played around with some of the earlier releases of ActiveRDF, and while it definitely had some rough edges, I liked the idea and am anxious to see how well it’s working now.