Rails - Aug 2011 - matching each subdomain to a different controller.

I want to create routes that map a subdomain to a controller.  Each
controller will have the same actions but they will have different
views and will do different things. So basically I want something like
this imaginary route

constraints(app = App.new) do
   controller app.controller do
       root :to =>  "index"
        get => "sign_up"
    end
end

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