Readability is the kind of development that might genuinely see this internet thing take off.

You drag the button on to your browser and it turns the text you are reading into something that doesn’t cause your eyes to convulse in an orgy of distraction; stripping all the ads and images out and reformating the text big and lovely.

So it turns this:
webpage before readability is applied

Into this:
Same webpage after Readability

Your Correspondent, Got songs in his blood; it’s a serious medical condition