I use the Marty Pauley’s MTKwiki plugin based on CGI::Kwiki since more than a year. It is a simple and useful plugin when you like to use the wiki syntax in Movable Type. But the CGI::Kwiki::Formatter output is not XHTML valid, which is a bit annoying when you try keep your blog in XHTML.
Brian Ingerson rewrote completely CGI::Kwiki into Kwiki which provides a lot of improvements including the XHTML support.
Thanks to the bad weather this Saturday afternoon in Paris, I decided to write a new simple plugin that uses Kwiki::Formatter instead of CGI::Kwiki::Formatter.
Here is the MT Kwiki Formatter plugin
By default, the Wiki links are disabled, but if you have a instance of Kwiki running on your server, then you can enable them via the plugin settings.