I am learning Clojure because I know lots of "traditional" languages and want to stretch my brain in new ways. I am also interested in new ways to write parallel programs, which is becoming a bigger and bigger issue. Clojure scores well on these two criteria. I chose Clojure over Scala and Haskell, because I believe in dynamic typing over static typing. This is probably more an issue of tase than anything and I also have a high opinion of those static languages. I am very impressed with Rich Hickey's design sensibility and his goals for Clojure align well with my own.