http://github.com/mattly/couchdb-ruby-query-server

It's not yet really "complete", but it passes all of the specs in the
official query server spec suite. Runs on 1.8.7 and 1.9, but not 1.8.6
yet. Haven't tested it yet with MacRuby or Rubinius.

Feedback, Bug Reports, etc, all welcome.

Matt Lyon