That said, I am likely to be using Lisp a lot next year: I have a partially written book on Franz AllegroGraph that the people at Franz suggested that I put on hold until their new version 4 is released. The free version of AllegroGraph is awesome (supports 50 million RDF triples, and easily used from Lisp, Java, Ruby, Python, etc. clients). The $$ version scales very well to huge data sets.