UPDATEI created a seperate page for Brightness controller http://www.holstschumacher.dk/p/brightness-controller.html
Brightness controller is a small tool for controlling brightness of Apple Cinema Displays on a Windows PC.
It has only been tested on windows 7 and my 27" Cinema Display.
Other models probably have different product id's so my tool won't work. I will try to update with other models as soon as i get the relevant information from users.
First beta release
Update about Hotkeys
I did not have time to make the hotkeys configurable in this release. But they are hardcoded to
CTRL + ALT + '+' to increase brightness
CTRL + ALT + '-' to decrease brightness
Updated With Screenshots