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It appears the original blog/site went down, the zip file is now attached: groovyquickstart.zip
Update (08/2008)
I will like to donate this code to be added to the groovy repository if possible.
Update
My blog was out of comission for a while , but I am working on updating this project to use the new joint compiler, in the meantime here is a new zip file containing the run file for linux groovyquickstart1.zip