They they could have added:
Second analog stick.
Bigger face and area so that buttons are more spread out.
Not gay.
Same ports (AC, TV Out, USB, MemStick)
Argh, don't get me started.
Everything has already been said but it can't be taken back now.
What I want is a way to play PSP games you already own without purchasing them again, something can still be developed.
I doubt it has a RAM upgrade, I haven't seen any figures.