3. I miss the hardware answer and end call buttons. It's wonderful to just know you'll be able to answer and end calls reliably.
Annoyances of mine, as well. More than a few times I've lost the call screen, had my phone drop into sleep mode, and fumbled around trying to end a call.
But I see a new feature, might be Froyo or another app, enables you to end a call by pressing the power button. Maybe someone could create an app where two quick clicks of the camera button would launch the dialer. Or long pressing the Home button (since I never use it to access recent apps).