Just a suggestion on managing the membership for multiple groups. I'd recommend having one list for each group, then a big list for all the groups. All the information would be sent out to people who were members of the group, (e.g. if I join the Bureaucratic Order of Individualists, I'd get a reminder for every one of their meetings, and any other important news). Important stuff, like major speakers, should go to everyone, no matter which sect of the conspiracy they belong to (e.g. if Cal Libs hosts someone who is currently running for senetor in CA, then mail should be sent to the Objectivists, the ANarchists, and the Ideological Libertarians as well) . Minor stuff should be kept within the group (e.g. if I'm only in the Objectivist group, I don't really care that Starchild is coming by to talk about internal party politics).