Springflash for Jailbroken iPhone 4

SpringFlash - It is a springboard Activator-based application that takes advantage of the iPhone 4 LED Flash to serve as a flashlight. You can have a touch of a button for a bright LED flashlight without hassling with unlocking your iPhone, closing your app, or even turning on your screen. To install SpringFlash, you need to jailbreak your iPhone 4.

springFlash

I just deleted the flashlight app from my iPhone 4--this is SO much handier!