Btw, I am curious. You said you were considering putting the one-way mirror between the backlight and the lcd? But wouldnt the mirror just reflect the external images back to you (like of your seat). Wouldnt you need to somehow diffuse this sunlight, then reflect it back? Maybe by putting it behind the backlight diffuser.
shotgunefx: you said you were thinking about backlight upgrades. Are you thinking about just adding more CCFL tubes? If the one-way mirror thing doesnt go too well, a backlight upgrade might help with the sunlight issue. When I took apart my screen, I was actually looking for places to do a potential backlight upgrade too. I was considering using some high brightness LED's, but the problem is how to diffuse the light. LED's deal with the cold much better than CCFL too. My Nokia 6265i cell phone uses 4 leds as backlight and this screen is readable even when I am standing outside at noon.