The presence of a touch screen on a device had previously sounded good in theory but always rather sucked in practice.
It typically involved stabbing repeatedly at touch screens on bank atms and grocery store card readers until they finally registered the contact and then occasionally decided to register it multiple times.
And the Sony Reader with touch reinforced all that. Touch, then screen flickers dark. Then one second later it scrolls -- hopefully not too far.
But the iPhone touch screen rocked. Did the touch two fingers to the Google map and squeeze or spread to zoom in and out. Scrolled instantly. Totally responsive.
Now just put that on a device big enough that I'll find several uses for it and I'll be pleased.