Uh, where is the proof that the iPod Touch screen is the same one in the iPhone 3G?
Are all 163ppi displays the same?
Good point. Maybe Apple is using a different LCD vendor that also happens to make a 163 ppi screen. (Although I think the iPod and iPhone 3G are one in the same)
But if you accept Apple's word that they have used 2 different screens, then this is proof that the iPhone 3G is using a different screen than the original iPhone.