Browsing the java.blogs entries, I came up to that article:
http://jroller.com/page/ie?entry=java_b_can_b_beWhich mentionned a new rapid development framework using Groovy:
https://slingshot.dev.java.net/Another Groovy-fied solution for rapid web development :-)
I feel though like it's not as Groovy as Grails, but I'm biased ;-)
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Guillaume Laforge
Groovy Project Manager
http://glaforge.free.fr/blog/groovy