<rant> I can't dim my droid enough. Most of my viewing is in dim light, so I need it as dim as it can get. That's a problem that I have with many light based displays.
I am extremely light sensitive. These billboards that are around now are TOO bright for me. The first time I noticed one was when I was flying and kept seeing a 'new' light about 15 miles away. I finally drove past it one day and realized what it was.
Headlights are the same. When they get too bright for me, I have two options: close one eye and look away, or close both eyes.
Since my phone is dim most of the time, when I do go outside with it, it's then too dim. What would be really nice, is if there was a physical contrast/brightness control on the side of the phone as opposed to being forced to see the screen to find the display features.
And don't get me started on blue lights (especially LED's).</rant>