Greetings,
I'm delighted to announce that there's now a new Ruby library for accessing the MediaWiki API. It's reasonably complete and up to date, with support for these API operations:
create, delete, download, export, extensions, get, image_info, import, list, login, render, search, semantic_query, undelete, upload
Open source, of course, and patches and suggestions more than welcome. Download yours here:
Gem: http://rubygems.org/gems/mediawiki-gateway Source: http://github.com/jpatokal/mediawiki-gateway
Cheers, -jani