I’ve taken another swing at making a brightness menulet like the volume menulet. My old version could only toggle brightness (because of UI problems). But the new version is a full on slider!
Here’s the xcode project and intel/ppc builds for at least mac os x 10.5:
Brightness Menulet Xcode Project
Brightness Menulet (intel)
Brightness Menulet (ppc)
Note: This menulet (and the original brightness code) does not work with 10.6 on my Mac Cinema HD display, but it does work with 10.6 on my girlfriend’s MacBook.