Clojure is actually one of the languages I've moved to, from Python, and is currently my favourite programming language to work in. Functional programming, immutable data structures, great built in data structure support, macros, excellent concurrency support, a good standard library and direct access to Java libraries all make Clojure a beautifully powerful and easy language to work in. The clojure community is also very friendly and growing every day, so if you need it, getting suppor is not hard.<p>I do still like Python, but theres so much more nice things out there. Besides clojure, I'm playing with Yeti and hope to give F# a look soon too. Maybe some day I'll have some time to play with Haskell also; its been on my todo list for a long time.