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personally i think mailing lists really oughta be kept seperate from the site membership.. being as anti-spam laws require now that they should ideally be based on the double opt-in system..
it wouldn't be hard being as phplist is template based aswell to wrap the subscribe and unsubscribe pages into a custom block and use it that way..
i know the admin interface would also be seperate by doing that, but it is a start..