http://search.cpan.org/~markj/WWW-Mediawiki-Client/bin/mvs
MVS is “a command line client whose purpose is to simplify offline editing of Wiki content”. I could have done with this last July when I was writing an offline Wikipedia dumper.
Fortunately, it seems the folks at Wikibooks are now producing PDF versions of many of their books, making my dumper script largely obsolete.