I've had a difficult time getting into either Clojure or Scala - bought a book on each, and had fun playing, but neither language felt great to me. I am stuck on (J)Ruby, Common Lisp, and Java when I need it.

BTW, Kenny is about as close to a "pure Common Lisp" purist as you can get. I worked with him for about half a year - cool guy,and very much focused on Lisp.