When it comes to early adoption of technologies, Eclipse stands behind NetBeans. Sun and the NetBeans Community,  last week, announced an early access release of the NetBeans Ruby Pack which provides support for the Ruby programming language.  As you already know that JVM will now allow scripting languages to be run on it.

The NetBeans plug-in offers developers added support for dynamic and scripting languages and includes editing features for both Ruby and JRuby - a 100% pure- Java implementation of the Ruby programming language that runs on the Java Virtual Machine.