The only times I've had problems with the touch screen on my N1, it turned out to be because one of my other fingers or the edge of my hand was overlapping one of the other edges of the screen. :-) For quite a while though I did think that my touchscreen would just stop working.
BTW.. you mentioned problems while charging. Do you keep the phone in the little neoprene pouch while charging? My N1 generates quite a bit of heat when charging with the supplied AC adapter. Doesn't seem to be a problem when the phone is just lying on my desk or my nightstand plugged in, but initially I used to leave it in the pouch at night while charging and it would get alarmingly hot in the pouch. Just an FYI.
BTW.. you mentioned problems while charging. Do you keep the phone in the little neoprene pouch while charging? My N1 generates quite a bit of heat when charging with the supplied AC adapter. Doesn't seem to be a problem when the phone is just lying on my desk or my nightstand plugged in, but initially I used to leave it in the pouch at night while charging and it would get alarmingly hot in the pouch. Just an FYI.