* http://www.mediawiki.org/wiki/Extension:FCKeditor_(by_FCKeditor_and_Wikia)
note that I had to patch a minor bug to get it to work and even then, it did funny things with my article (wanted to collapse a line-break between template tag and next line resulting in a space being inserted prior to the next line, resulting in preformatted text rendering for that line.
=== OpenOffice ===
OpenOffice (since v. 2.3) has had a built-in "Export to MediaWiki" menu option. So, you can write an article in OpenOffice Writer (or StarOffice Writer) and export the file to wiki markup. This could be useful particularly if you want to convert large collections of Word documents. One drawback to "export" is that you would still have to copy and paste that output into the wiki.
http://extensions.services.openoffice.org/project/wikipublisher allows you to save your page in the wiki
Other points about using MediaWiki