If it doesn't exist, I might write a Word2Wiki2WordSync....
I for one would very much welcome a Wiki-to-Word (or even better: to OpenDocument) converter.
In fact, that has already been attempted: http://tools.wikimedia.de/~magnus/wiki2xml/w2x.php However, that doesn't really work perfectly AFAIK.
I've been told that converting MediaWiki markup to any other format is difficult at best; that's because there's no proper parser, which usually results in possible ambiguities and whatnot... (this description may be somewhat inaccurate, but it should do the trick here)
Still, being able to post-process wiki-created documents in a word processor (e.g. for publishing manuals) would be great!
-- F.