After much procrastinating I've decided to upload the DocBook style sheets I created in January to a new guide on this site. This isn't really the *best* place for them. They ought to be in a version control system like Launchpad or GitHub or something, but I'm tired of trying to figure out the best place and have just uploaded them!
If you've got more tools to share as well, please add them to: http://writingopensource.com/tools