The article seems largely theoretical in nature - "efficient Actor implementations are possible". Why no links to these implementations? And if they actually do

The article seems largely theoretical in nature - "efficient Actor implementations are possible". Why no links to these implementations? And if they actually do exist how do they compare to Clojure's use-it-today high performance single-machine concurrency implementation? Also, his counterpoints sound like they either add incidental complexity or refer to papers not implementations. In anycase, Rich wasn't banging on Actors. He simply was arguing for his approach to concurrency over one of the most popular Actor implementations actively used in production today - Erlang. And finally, here's a pretty interesting project for distributed computing with Clojure: http://github.com/amitrathore/swarmiji http://github.com/amitrathore/swarmiji