Lately I've been taking the bus rather than the train to work. At my current client location, it's more convenient, and cheaper to boot.
This morning a young man across the aisle from me had a Treo and was plugged in listening to music. It was loud enough to be annoying where I was sitting -- yes, even over the noise of the bus engine. I can only imagine what it was doing to his own eardrums.
No wonder iPod users are going deaf.