Young & Upcoming Generation of Powerful Languages

Several upcoming popular future programming languages including some on top of JVM and CLR ( IronRuby, Scala , Clojure, Groovy, F#, Erlang, Haskell ..) . Well One of the advices in “The Pragmatic Programmer” says: "Learn at least one new language every year", in order to be a good hacker....But one should be careful of choosing what language to learn rather than just learning up new syntax for same things.