Have you thought about learning Scala or Clojure? Don't let the fact that they run "on Java" put you off. They're excellent languages but run on the JVM, and th

Have you thought about learning Scala or Clojure? Don't let the fact that they run "on Java" put you off. They're excellent languages but run on the JVM, and their cultures are different enough because of the very high (at least for now) quality of the average developer in these languages.