JRuby started off looking like a novelty project with little practical use, but in less than a year it’s become a practical tool, something with definite advantages over it’s more established rivals. IBM, Oracle and Sun are already using it themselves for web apps. Netbeans 6 has rather good support for Ruby built in, and much as I cringe when running Tomcat servers (from a sysadmin’s perspective) from a developer’s point of view .war files are a definite advantage.
This article describes what happened when some of Sun’s Java web developers chose to try JRuby and Ruby On Rails.
I think JRuby is going to do very well in 2008.