There has been a lot of buzz lately among users regarding AMOLED display powered mobile phones. The major technical difference of AMOLED from others such as LCD TFT is that the layer which detects touch is integrated into the screen rather than being overlaid on top (as on LCD TFT devices). Here are a couple of short videos which will help you understand AMOLED better as a prospective buyer.
The video above compares the AMOLED display of the Samsung Omnia Pro with the traditional display of the LCD.
Here is another video which compares the AMOLED and TFT LCD screen on two different Digital cameras.