I got an iPhone 3G S this morning – I couldn't hold out any longer, though I fear I'll be a martyr to its bulk in my pocket and its thirst for juice. I was very pleasantly surprised to pull the power adapter from the box and find it's actually smaller than most UK plugs! It is literally just a fairly small plug with a USB port on the bottom. Here it is on the right, alongside a picture of the comparatively vast two piece 3G version that my wife has.