I have free PDFs of the Lisp and Java versions of my semantic web book at http://markwatson.com/opencontent/ The Java version uses both AllegroGraph and Sesame. I provide a wrapper for Sesame adding geolocation queries and text search (I embed Sesame, Lucene, and DerbyDB). Fun to hack on if you are so inclined. The code is on github.
BTW, Alex Ott kindly sent me some code improvements to the Clojure wrapper in my book. If you don't mind using a commercial product (with a free version that works with 50 million RDF triples) then use my Common Lisp edition and code that uses the AllegroGraph product - a very nice hacking experience.
I will try to do that if I have time. My view in a nutshell...it's not all that YET, but it is FINALLY about to take off in a big way. (Yes, for real this time.)