only change they could do (beyond the obvious upgrades to storage, cpu and ram) would maybe be to change the display into something like what used on the dell latitude tx tablet pc.

http://www.n-trig.com/

that way one could use a stylus (it has its uses, no matter what the iphone people say), finger or keyboard (either on screen or physical), and get accuracy that would really put what one have today to shame.

btw, didnt apple shop around for a handwriting expert recently?