As several tipsters have pointed out, the recessed iPhone
headphone port means that a lot of third party headphones don't work properly: we've tested a few models already (you can see the current list after the break), but maybe you can help us out and let us know which models work / don't work in the comments -- and yes, if you have to press down on the jack to get both channels to play sound, we count that as not working. You'll need to buy a $10 headphone adapter if you want most third party headphones to function correctly, which sounds like a great business plan to us: just break an important device function, and sell the solution for fun and profit. For now, one of the few third party 'phones that do
work are the Zune headphones.