Application Layout Decider

class AdvertsController < ActionController::Base
  protect_from_forgery

  # Non-adminny controller, delete the adverts.html.erb from app/view/layouts, it'll default to using
  # application.html.erb
end

class AdminController < ActionController::Base
  protect_from_forgery
  before_filter :login_required
  before_filter :admin_required

  layout 'admin'
end

class Admin::UsersController < AdminController
  # Lovely and empty now!
end