I've seen countless attempts to tackle the problem of tangled headphone cables, but this approach -- which uses thicker less-flexible sections to make them easier to bundle -- looks like it has a lot of potential.
Instead of sticking your headphones in your pocket all mashed up into a ball that's destined to become one large knot, the segments on this set stack together like an accordion. It not only serves to keep them neat and easy to unravel later, but it also makes bundling and securing your headphones' cord a cinch. Sadly, it's still just a proposed Quirky product that's waiting for enough support to become a reality. So if you like the idea, I'd suggest heading over there and letting them know. [Quirky]