comp.lang.ruby - join
The Ruby dynamic OO programming language.
High activity, 7743 subscribers, Usenet

ruby-talk-google - join
This is a mirror list of the offical ruby-talk mailing list. It serves as a alternative to the mail<->news gateway (comp.lang.ruby). It exists to provide access to the mailing list via the convenience of Google Groups web-based client.
High activity, 3165 members

Deploying Ruby on Rails - join
Discussions related to deploying and hosting web applications built with Ruby on Rails.
Low activity, 1315 members