I love ICS. It's the reason I bought the Galaxy Nexus. The color scheme is very nice and subtle. Indoors, that is.
The blue lettering on a black background (pull down the notification bar for an example) is almost impossible to read in bright sunlight. The screen is bright enough outdoors when there is contrast on the screen, black on white or white on black is fine. But there are many things I have to guess at. The home button and back button are too feint to see in daylight but since they're consistently placed I can guess at them and figure it out.
I wish there was an "Outdoor" setting that made for better contrast. Microsoft has had this built into Windows for decades, one would think that Google would notice this and accommodate the outdoor folks.
Actually I am very interested in this idea. When the light sensor is saturated have the option to auto fade to a a high contrast color scheme, at least for system, maybe Google apps. Time to hit the code
Edit: Let me also say that I have no real problem reading it in bright sun, I just like the idea and think it would be good to integrate for devices without such great screens.
Tabguy, do you use autobrightness? or have it set lower all the time? that could severely effect your ability to see it.