Looks like a fun project but without RDFS inferencing, may not be too useful. Without at least RDFS inferencing (and OWL would be nice) I don't know how you can merge data from different sources using (for example) different property names that have the same 'meaning', etc.
Mark, you could use the RDF::Sesame plugin (http://rdf.rubyforge.org/sesame/) to interface to Sesame, which does inference for you. There is also an in-the-works RDFS gem (http://rdfs.rubyforge.org/) that will provide RDFS++ natively in Ruby for any RDF.rb-compatible graph or repository.
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