I see now
Yeah I have always used USB so thats why I neve noticed the chnage, but when I read the iphone didn't chagre in the car I walked out to my car to test my charger I hadn't used it yet for the new phone
You are mistaken. Here, lemme explain to you exactly what people are talking about:
The first generation iPhone could charge over a USB connection OR a FireWire connection. Your charging cord is probably USB so you never noticed a difference because both iPhones are compatible with USB charging. However, when the iPhone 3G came out, Apple removed the FireWire charging capabilities from it so people who were using FireWire cords in their cars can no longer charge their iPhone 3G with it.
This is why even some speaker accessories will not charge the iPhone... they use the FireWire interface instead of USB 2.0.
Yeah I have always used USB so thats why I neve noticed the chnage, but when I read the iphone didn't chagre in the car I walked out to my car to test my charger I hadn't used it yet for the new phone