What a great idea.
I stumbled across this design for zippable headphones  through another blog.
The earbuds zip up and down, preventing tangling and breaking. They have a volume control in the zipper.
It's genius. I don't know about you, but my earbuds always end up tangled and knotted around my purse, or else firmly wound around something else.
This leads to two questions:
1. Where can I get these?
2. Why didn't I think of that?