The iPod Touch, iPhone and pretty much every high-end phone uses a capacitive touch screen.
wierd thing is on wikipedia, they said resistive touch screen could be better quality than capacitive. :/ then again wikipedia isn't always true.
"In some circumstances, this is more desirable than a capacitive touchscreen, which has to be operated with a capacitive pointer, such as a bare finger. "
http://en.wikipedia.org/wiki/Resistive_touchscreen
Technology 4-Wire Resistive Surface Acoustic Wave 5-Wire Resistive Infrared Capacitive
Durability 3 year 5 Year 5 Year 5 Year 2 Year
Stability High Higher High High Ok
Transparency Bad Good Bad Good Ok
Installation Built-in/Onwall Built-in/Onwall Built-in/Onwall Onwall Built-in
Touch Anything Finger/Pen Anything Finger/Pen Conductive
Intense light-resistant Good Good Good Bad Bad
Response time <10ms 10ms <15ms <20ms <15ms
Following Speed Good Low Good Good Good
Excursion No Small Big Big Big
Monitor option CRT or LCD CRT or LCD CRT or LCD CRT or LCD CRT or LCD or LED
Waterproof Good Ok Good Ok Good
thats the table at the bottom of this page :/ i don't believe it though, 2 yrs pffft, my touch is still going strong.
http://en.wikipedia.org/wiki/Capacitive_touchscreen#Capacitive