The idea behind Rack middleware is that it's incredibly easy to implement for the developer and re-usable across the spectrum of Ruby web apps. Yes, implementi

The idea behind Rack middleware is that it's incredibly easy to implement for the developer and re-usable across the spectrum of Ruby web apps. Yes, implementing Google Chrome Frame in a given app is trivial. But removing this from the concern of a given app and into a re-usable middleware is where I think it's useful.