Geek & Mild by Sean Sperte

Lab Tick allows you to override Mac OS’s automatic toggle of the keyboard backlight, and manually set the brightness. It’s Leopard compatible, but is still in beta and hasn’t been updated since December.

This addresses an issue I didn’t know existed. I’ve never been able to manually adjust the backlighting on my PowerBook keyboard, but apparently MacBook Pro users have been able to do this until the most recent OS update.