Most newer Windows Mobile devices (even back to the Touch Pro) include "Ambient Light Sensors", which basically allow detection of how bright the room is, and sets the backlight for maximum viewing and optimal power. The only problem with this solution is that it requires extra battery life to control this sensor. In the long run, the device will be burning through juice, rather than actually saving power. 

While most people probably won't see enough of a difference to care, those of us who are looking for optimal power will like to disable this feature. On Windows Mobile, navigating through backlight settings can be a pain. To solve this, MyLostBlog has written a finger-friendly application to control your backlight settings. You can download it from their site here, or download skins for it from biernes_atrece here.

[Via: XDA Developers]