The iPhone is hardly perfect, although it is quite good for a smartphone. However now we are loading up our iPhones with dozens of added applications, the old swipe-able screen interface needs a bit of care.
The first improvement would be the ability to tag particular screens with names. This would be merely an aid to organisation, but in practice would be very handy. There is plenty of space in the status bar for the “name” of a screen, or Apple could do something funkier involving putting the name onto the background.
Secondly it would be handy to have icons that could “warp” to a particular screen – presumably by name. This would work as a simplistic form of ‘folders’ for the applications.
Finally it would be useful to be able to make certain application icons “sticky” so that they remain available no matter what screen is currently active.