Im of two different minds with the reorientation of the headphone jack. The bottom position is not new for Apple: currently all iPods (excluding the classic) have the same positioning. It makes sense to put it on the bottom if you are coming from one of these devices, and also makes sense from a manufacturing standpoint: all acoustic elements excluding the top earpiece are in the same area. But, people coming from the previous iPhone (more likely) find this change annoying. I can sympathize with dissenters. Having the headphone jack on top meant the iPhone could rest flat in a pocket or cup holder with a device plugged in. But, having the jack on the bottom removes the need to wrap the headphones around the top and have the connector on the bottom, which gives the phone a better aesthetic appeal. As a counterpoint to this, pressing the sleep/wake button at the top requires this awkward deep reach into your pocket. Tradeoffs.