Some of my beta users asked me about exporting to word. Previously the site only allowed the user to create ePub, HTML and PDF's. This request just kept popping up, so I built it.
I used a Gem that converts html to word, and after some fiddling, I got the thing to work well. The biggest hurdle was making it so the word doc was spell-checkable. For some reason out of the box the file didn't let people spell/grammar check once.
I added a template to control the look of the word doc, and now my users can export 4 formats. :)