I started playing with the Mephisto contact form plugin written by James Crisp and added a very minor modification to allow users to edit the destination email address from the plugin configuration admin section.

mephisto_contact_form/lib/plugin.rb becomes

module Mephisto
  module Plugins
    class ContactForm < Mephisto::Plugin
      author 'James Crisp'
      version '0.1'
      
      option :destination_email_address, "Enter your address here"
    
      public_controller 'ContactForm', 'ContactForm'
      add_route 'contact_form', 
                    :controller => 'contact_form', 
                    :action => 'contact_form'
      add_route 'contact_submit', 
                    :controller => 'contact_form', 
                    :action => 'contact_submit', 
                    :conditions => { :method => :post }

    end
  end
end

and mephisto_contact_form/lib/contact_notifier.rb becomes

class ContactNotifier < ActionMailer::Base
  include Mephisto::Liquid::UrlMethods
  
  self.template_root = File.dirname(__FILE__) + '/views'
  
  def contact_notification(contact_message)
    recipients      Mephisto::Plugin['ContactForm'].options['destination_email_address']
    from            contact_message.author_email
    subject         "[Mephisto Contact Form] #{contact_message.subject}"
    body            "contact_message" => contact_message
  end
end