Clojure seems to get a lot of attention, but don't forget Common Lisp. If you're tired of the reinvention treadmill and want a great language that is actually m

Clojure seems to get a lot of attention, but don't forget Common Lisp. If you're tired of the reinvention treadmill and want a great language that is actually mature, CL can be excellent. CL also has great runtime support: SBCL (for super performance) and ABCL (if you need the JVM).