As for capacitive screens.
I was somehow a big fan of capacitives, thinking that my tablet's resistive is inferior.
That was until I've had HTC HD2 in my hands.
With low resolution displays like on Iphone and of course with UI designed for fingers only - it's more than OK, but HD2 with it's WM (even with modified HTC interface) is not very friendly.
High resolution and small switches/buttons etc scream to me "use Your nail" - and oops - I can't use one... I have to cover a large number of pixels behind my fingertip and believe that I'll make the right press/slide action.
I'm cured off capacitveness