I wonder if HTC did this:
"Alternately, a clever hardware company could make a mobile LCD controller that takes a 16 bit Frame Buffer and dithers up to 18 bits to match the screen. That would get you some benefit out of the better screen with no hit in speed. We would very much like to see this happen, but, to my knowledge, it hasn't yet."
That's quoted from the fact sheet that someone posted earlier. Here's the link:
http://blogs.msdn.com/windowsmobile/...07/462187.aspx