So, ikiwiki keeps wikis in git. But until today, that's only meant that the wiki's owners can edit it via git. Everyone else was stuck using the web interface.
Wouldn't it be nice then if anyone could check out the wiki source, modify it, and push it back? Now you can!
git clone git://git.ikiwiki.info/ cd git.ikiwiki.info vim doc/sandbox.mdwn git commit -a -m "I'm in your git, editing your wiki." git push
The secret sauce, that makes this not a recipe for disaster but just a nice feature, is that ikiwiki checks each change as it's pushed in, and rejects any changes that couldn't be made to the wiki with a web browser.
So if you use ikiwiki for a wiki, you might want to turn on untrusted git push.