I think a starter would be some skin modification, like the "printable version". This would produce an HTML that could be opened in Word.
Not a bad idea per se, but from my experience, Word (or any other word processor) is horrible at working with HTML - especially if you aim to re-integrate the resulting edits into the wiki.
If preformatting in pages is desired, maybe a "print do PDF" would help. I'd guess there is plenty of software that can convert HTML to PDF.
The problem with PDF is that it cannot (easily) be modified using a word processor, thus eliminating the possibility to post-process documents for page-based layouts.
-- F.