Re: The right way around!
"Surely if the headphone socket is at the bottom, then when it's in your pocket the headphone lead needs to go down then up to get to your ears? And the 3.5mm jack gets stressed as it's taking some of the weight? And if the lead gets caught there's little chance of just the plug popping out before the whole phone goes airborne?"
Eh? When the phone is in your pocket you want the top facing down so when you pull it out it ends up the right way up in your palm - this seems most natural when it is upside-down. As such headphone sockets should be at the bottom of the phone.
Power is more variable - if recharging via cable then socket should be at the top so that cable is not stressed or gets in the way when you glance at it or use it when sitting down. (I know, what a lazy weakling, having to rest my wrist on my thigh.) But for docks you want it at the bottom. Because of this interface should always be flippable as docks require upside-down use.