My wife bought a new shuffle to use when exercising. Unfortunately, she doesn't have Apple design approved ears, so the iPod earphones just drop out. She has some nice shiny Sennheiser sport headphones but there's no way to get the shuffle to work.
Result, you need to go out and buy an adaptor. This Belkin one does a fine job, and she's happy with it, but frankly this is not a problem that should have arisen in the first place. A real Apple blunder which results in extra cost if you want to use someone else's headphones.