> If I ever"upgrade" my car audio, I'm going back to an old-school style unit, with an aux plugin. Last week at lunch, we were lamenting the disappearance of h

> If I ever"upgrade" my car audio, I'm going back to an old-school style unit, with an aux plugin. Last week at lunch, we were lamenting the disappearance of headphone jacks from phones. We speculated that a Bluetooth-to-jack adapter would be a popular accessory, letting people keep their old headphones for use with their latest media players. I'd wager there's a whole class of products that might fit here, for example a set of old-fashioned analog knobs backed by Bluetooth or some other interface to the players, as an alternative for those who feel more comfortable - or safer - with the old gear.