Ruby plug-in for Eclipse, RDT

Looks like IBM is researching Ruby and Eclipse. At IBM developerWorks, I found this article (published 10/11/2005) about the Ruby Development Tools (RDT) plug-in for Eclipse, "Using the Ruby Development Tools plug-in for Eclipse". Looks like they are making a lot of progress with the RDT plug-in. The target audience for RDT is Java developers who are interested in what Ruby has to offer.