Just a week after telling us that the 3.7" AMOLED as used in Google's Nexus One costs $23.5, iSupply now says that the 3.7" TFT-LCD used in Motorola's Droid costs $17.75. That means that the AMOLED costs 32% more. The touchscreen overlay costs $17.75 in both the Nexus One and the Droid. This means that totally, the AMOLED touch display is only 16% more expensive than the touch TFT-LCD.
Interestingly, the iPhone 3GS' LCD is smaller than the Droid's (at 3.5") but costs more - $19.25. That means that Google's 3.7" AMOLED costs only 22% more than the smaller iPhone display.
Obviously these are just iSupply's estimates, but it's interesting anyway.