I'm about to resurrect an old thread, in hopes of putting it to bed for good! I took my install off of the indefinite hold it's been on for almost a year, and I just had some new thoughts on this issue...
Bugbyte's AppleScripts mentioned above work great for an Apple notebook or cinema display, but unfortunatly have no effect on the touchscreens most of us are using. However, using Shades, you can adjust the screen brightness of any display connected to any Mac, as the adjustment is not dependant on any specific type of hardware. It also has the ability to assign hot keys to increase and decrease brightness functions.
As I mentioned earlier, I have no coding skills at all, SO, would someone be willing to write up an AppleScript similar to Bugbyte's that opens Shades (if its not already running) and sends the hot key combinations to it? Shades can run hidden in the background (in its preferences, keep it out of the dock and the menu bar), and we can set the resulting Apple Script as a reccuring iCal alarm, to seamlessly automate the process of dimming and brightening our touchscreens at predetermined times of the day.
I would be totally thrilled if someone would be able to do this! Thanks in advance :-)