Route all requests to one action

see api docs for "Route Globbing":
http://api.rubyonrails.org/classes/ActionController/Routing.html

e.g., make a 'default' controller, and in your routes.rb, make this
the last route:

  # send everything to 'default' controller
  map.connect '*path',
    :controller => 'default',
    :action => 'index'