Generally, I'm the last person to suggest we use technology to control people's lives and what they view. However, it's also the duty of parents to help teach their children how and when to use the media. Most commonly today you see things like the V-chip, which let parents block their unskilled children from seeing shows with certain "ratings."
Thinking more about the future of mobile audio (see Tivo for Radio Entry) I start to wonder if XM and Sirius satellite radio are doomed propositions. They seem like a good idea, nationwide radio, 100 channels, many commercial-free.
But how many of the stations does any given listener actually use? I would guess most people only listen to a few of them, just as they only listen to a few on the local dial.
Recently, we picked up a Rio Karma, which is a 20gb handheld jukebox that plays MP3, WMA and Ogg Vorbis. Particularly nice things about it include the Ogg support and the fact it has Ethernet, so that any machine on our net can transfer music into it. That's about all it does with the ethernet (it also has a small web server to serve the manual and a java transfer app) but I expect it will do more later, like be a streaming media gateway when docked on the stereo, allowing control from anywhere.