intertext

This will probably sweep the internets now that Stephen Fry has posted about it on his blog, but never mind. It deserves to sweep. And my link is to a fuller version of Eco's essay than the one referenced by Stephen Fry.
Here's a taste:

The fact is that the world is divided between users of the Macintosh computer and users of MS-DOS compatible computers. I am firmly of the opinion that the Macintosh is Catholic and that DOS is Protestant. Indeed, the Macintosh is counter-reformist and has been influenced by the ratio studiorum of the Jesuits. It is cheerful, friendly, conciliatory; it tells the faithful how they must proceed step by step to reach -- if not the kingdom of Heaven -- the moment in which their document is printed. It is catechistic: The essence of revelation is dealt with via simple formulae and sumptuous icons. Everyone has a right to salvation.