Actually saw one worth noticing tonight!
I'm a server at a restaurant, and, unfortunately, I all too often see teenagers and younger sitting at a table/booth with their iPod on, iBuds in their ears. It's kinda depressing to think about taking your kids out to a nice dinner, and having them want to do nothing but listen to their iPod instead.
However, tonight, I got a bit of a surprise. A mom and her two kids, who couldn't be older than 5 and 8, were both listening to iPod Nanos with Shure IEMs! I'm not into IEMs, so I'm not sure at all what model, but they were black cased, and had black tips on them that looked like little olives. One of them also had something that looked like the end of an iPod to computer dock in the bottom of her Nano. Dunno what it was, not a line-out dock, since she was listening to the headphone out. It was just this little white piece of plastic attached to the dock out. Maybe some sort of protector? I imagine they'd make them smaller if so. Oh well.