http://en.wikipedia.org/wiki/Wikipedia:Computer_help_desk/ParseMediaWikiDump links to Parse::MediaWikiDump, a tool that can handle those dumps. The documentation for the Parse::MediaWikiDump::page class has an example that dumps title and id for each page. Replace the print with print ${$page->text()} and you get all article texts. Not much work for you, but perhaps for your machine. ;-)

BTW:

This software is being RETIRED - MediaWiki::DumpFile is the official successor to Parse::MediaWikiDump and includes a compatibility library called MediaWiki::DumpFile::Compat that is 100% API compatible and is a near perfect standin for this module. It is faster in all instances where it counts and is actively maintained. Any undocumented deviation of MediaWiki::DumpFile::Compat from Parse::MediaWikiDump is considered a bug and will be fixed.

Looking at http://search.cpan.org/~triddle/MediaWiki-DumpFile-0.2.1/lib/MediaWiki/DumpFile/FastPages.pm, I see an example that should give you exactly what you want: Plan text phrases from a Wikipedia dump written to STDOUT or whatever is currently select()ed, and optimized for speed.

Alexander