The Hero System (Champions) Mailing List (originally maintained by Geoff Speare) is now maintained by me, John Desmarais and hosted by Tom Arnold (no relation to Rosanne) from his Sysabend system, part of his ISP, Three Bubbas InnaNet.
The mailing list was created for Champions (and other Hero System derivatives) gamers and GMs. On this list, people discuss the game rules, powers, campaigns, and occasionally post character write-ups. It also serves as a source of information on Champions and the Hero System, as well as serving as a forum for meeting Champions/Hero players around the world.
The Mailing List is managed by GNU Mailman v1.1. Mailman is software to help manage email discussion lists, much like Majordomo and Smartmail. Unlike most similar products, Mailman gives each mailing list a web page, and allows users to subscribe, unsubscribe, etc. over the web.
More (and possibly useful) information to follow as I get it written.