If you have the Apple headphones with inline controls that ship with the controless iPod shuffles or either of the Apple ear-phones with remote and mic that are sold separately, you should check out this ars technica item:
If your Apple headphones failed, don’t throw them out. ars technica advises you to contact Apple who will replace your headphones free of charge if you follow their instructions which includes returning the failed headphone product.
You can find details about the replacing your non-functional Apple headphones here:
Apple will replace your headphones if they fail or intermittently have any of the problems listed below:
– Controls are non-responsive or work intermittently
– Unexpected volume increase or decrease
– Unexpected playing of voice feedback