As far as I know Atlassian uses a customized version of OSQA and has a private repostitory for it:
Are there any plans on improving the editor and maybe integrating a port of Wiki Style Renderer? I think this could be a huge improvement to the current editor.
Mostly usability issues. With Wiki Markup you have more control on what you are doing. When you are used to it, it's hard to use anything else... ;)
Just a few points:
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