I'm very pleased to announce an "official" release of the Grails Audit Logging Plugin. The Audit Logging plugin is designed to hook into any of the grails security plugins and record which user changed what values from which URI inside your grails application. It also adds an onChange event handler to your configured GORM classes that allow you to review the values in the class before and after the insert and perform conditional actions based on changes.
I've written in depth about the construction of this surprisingly simple plugin and I'm very happy to be able to make this contribution to the growing base of Grails plugins.