OK, I think the i-Pod is a marvellous invention. Superb for ease of access and no fiddling with CDs etc in confined spaces on tubes planes etc. Its curse, or the downside to it to be more polite, is the total lack of investment by Apple in a decent set of head phones to go with the i-Pod. This leads to passive i-Podding, and this causes stressful journeys for some poeple, including me. There are at least double the number of people using headphones on the Jubilee line every day compared to two years ago, and so the irritating "chk, chk, chkitty, chk" now comes from several more sources than before. People become very defensive about their right to listen to their i-Pod at whatever volume they see fit, and refuse to change the volume when asked to. They are also invariably reading either a newspaper or a book at the same time, and so are probably only using the music as background. So, I have three things to say. In the absence of a known tMP ENT specialist, I will say that in x years time, when your hearing is shot because you've been blasting youri-Pod into your ears too loud day in day out, don't expect the NHS to pay for corrective action. If someone asks you to turn your i-Pod down when you're on the tube or a bus, please do. Allowing that Apple have made so much money out of this amazing product, they should come up with lightweight, noise reducing and sound proof headphones to be sold as part of the package. Harrrumph!!