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There is also a Clojure plugin for Grails which provides easy access to execute clojure code from any Grails artifact (controllers, taglibs, services etc...): http://grails.org/plugin/clojure
Not to be left behind Griffon also sports a clojure plugin, based on the Grails one: http://griffon.codehaus.org/Clojure+Plugin. Among it's features you'll find: script loading at runtime (like Grails), class generation using clojure's macros and a repl.