Southwest is introducing a new low fares program called Ding. Yes, Ding. Consumers will download a piece of software (called Ding) onto their desktop, and it will alert them to Ding specials, which are only good for a few hours or so. Or maybe a day (it’s not really clear). In case the consumer doesn’t quite get it, your computer will make a Ding noise when new fares are available. The airline promises that the download application does not contain spyware. Ding to that.