I ran into it here.

http://www.barneyb.com/barneyblog/2008/02/11/barney-and-the-holy-grail/

Sean Corfield wrote on it

http://corfield.org/blog/index.cfm/do/blog.entry/entry/Grails__a_first_look

I have been looking for a replacement for CF for some time now. I am not taking any chances and started learning Java. As you might know Java is huge and it is going to take a while to get up to speed with it. I have played with ROR and and Jruby I am not fond of the syntax or the development process

Enter Groovy and Grails. Grails makes some pretty complex and advanced techniques ridiculously easy to do. And the language is similar enough to CF and CF script to make the learning curve and barrier to entry not as steep as say Ruby or Java. And since it creates Java Byte code it should (in theory) run side by side with CF (That is this weekend’s science experiment). Basically to lets you write Java apps with out having to actually write Java.

http://dev2dev.bea.com/pub/a/2006/10/introduction-groovy-grails.html

http://groovy.codehaus.org/

http://grails.org/