For my current work task, I am using it for information extraction from Freebase which requires a lot of JSON manipulation. I was using Ruby but Clojure use is preferred at CompassLabs (both languages are well suited for Freebase data hacking).

I mostly use Java for Hadoop machine learning work, but I may transition to Clojure in the next few weeks (my CTO has suggested this).

Earlier this year, I added Clojure examples to my last book on the Semantic Web.