A friend of mine recently had a bright blue pixel show up - and stick - on his iPhone 3G’s touchscreen. He told me about it, and I recommended he go to his local Apple Store and see if the Genius Bar would swap the device, as it is still under warranty and had no damage.
In the past, they would have simply swapped it, but instead, a Genius took the phone into the back room and replaced the glass (which includes the LCD display) while he waited.
