I just released a little package called wikir that attempts to convert reStructuredText to Wiki syntax.
Why? Mostly because I have a lot of projects hosted on Google Code and reStructuredText is my documentation weapon of choice. It's also widely supported in the Python world, The Cheeseshop, pydoctor, etc.
The 0.1 release has some very basic things working. Next I hope to add an entry_point that can list modules and their respective wiki files for the publish_wiki command and have that hook into the standard wiki directory of a Google Code repository.