routes.rb

# Some bloggish site that has a default route to display pages at
# SEO-friendly URLs, like /here-is-my-new-blog-post
ActionController::Routing::Routes.draw do |map|
  map.resources :sections

  # because this route matches everything, the plugin routes will never be hit.
  map.connect "/:name", :controller => "pages", :action => "show"
end

routes.rb

# A plugin doing auth-type stuff
ActionController::Routing::Routes.draw do |map|
  map.login "/login", :controller => "session", :action => "new"
  map.logout "/logout" # ...
end