Second article in new IBM developerWorks series alt.lang.jre is an introduction to the Groovy language by Andrew Glover entitled Feeling Groovy. The first article in the series is Get to Know Jython by Barry A. Feigenbaum and is also worth a read.
Groovy has a possible advantage over Jython in that it has become the subject of a Java Community Process (JCP) project (JSR 241) and so may become a “standard” for scripting Java objects. It is more Java-flavoured than Jython yet provides some familiar features. It might be worth considering for EG-358 because it could be introduced without needing the context shift that J/Python requires.