I'm so glad to be a part of this exciting development and learning more day-by-day learning the roots of programming and exploring the variety of languages that run on the JVM to expose me to these ideas. Sometimes overwhelming, always exciting, this is the world of polyglot programming.
Checkout this interesting interview with Venkat Subramaniam, founder of Agile Developer and a proponent of polyglot programming, concerning scala, groovy and the JVM.
There is also a new book from O'Reilly titled, The Well-Grounded Java Developer, that dives into the polyglot phenomenon occurring on the JVM and the advances of Java 7 to embrace dynamic languages. Check out chapter one from the Manning Early Access Program for free.