UPDATE: This video has been removed from YouTube

Here's a nice video comparing Samsung's Omnia II AMOLED display (3.7", 480x800) to the Nokia N900's 3.5" LCD. The AMOLED is on the left, and you can see that it's brighter, and has much better colors and contrast.

Kyulux - Hyperfluoresence OLED emittersKyulux - Hyperfluoresence OLED emitters