Creating Word docx documents dynamically from Grails (or Java :-)

I’m presently working on a little side project that needs to generate a bunch of customisable client reports. One format of interest to our target market is the ubiquitous Word document. Now I know that Word switched to an zipped XML format a while back, so it’s given me a chance to do some researching into what Java libraries might exist for creating and editing the Word xml format. I’ve played with Apache POI before, [...]