There are always things you forget to include aren't there?
In this case I really meant to point to a couple of things Tellart have done using sound: SoundAffects which uses music and sound to 'illustrate' city data in really interesting ways. And their Love Song Machine (above) which makes music, music that's physically present with the listener but distantly controlled by the player into a kind of remote wink of acknowledgement.
And then people are prompted to send you interesting things. Nicolas sent me this story:
"A friend of mine who works on Air Traffic Controller apparatus told me that they often rely on dot matrix printers that print text documents when aircraft are approaching. These printers emit a very specific noise (remember that?) and when they have been replaced by a new one controllers complained that they lack this sound to make their decisions..."