2 things... 1. How annoying is it that bumper manufactureres don't spec a slightly larger diameter in the cutout for the 3.5mm headphone input (connecter housing) to allow connection of larger size headphones? The stock iPod/iPhone headphones have a super slim connector housing... 2. The 'thinness' of the iPhone 4 is such that it's almost impossible to allow for much more diameter anyway! A real pain in the ass if you want't to use a bumper and different headphones, and let's face it all the stock iPhone headphones are good for is hearing damage. Anyone found a good bumper that can accommodate standard headphones?