Review: Palm Pre
The Pre uses a capacitive touch screen. In the time I've used the device, I've found it to be a little finicky. Perhaps as much as 20-25% of the time it doesn't accurately register screen presses, necessitating a second press. This gets old (with any phone). It works better than resistive touch phones, especially when it comes to scrolling. (Lightly swiping your finger across a capacitive screen is always easier than dragging while applying pressure on a resistive screen.)
There does not appear to be any way to calibrate or test the screen's accuracy. There is no haptic feedback.