I was up last night hacking on my toolchain and getting it ready for production, and I realized that part of it could be ripped out and put up as a library. I had searched for this library and found nothing, so I scratched that itch and tossed it together. I use Emacs MUSE mode for most of my fiction writing, and decided I was tired of having to rely on the full Emacs environment to export my stories to my other website, so I wrote an exporter in python.
It's very raw (isn't everything I write "very raw?") and it's missing some functionality, but it's good enough for me. If it's good enough for you, enjoy: Muse2Html.py