Most of the Android phone has camera flash. And it should not be used in taking photo during night only. It can be used as flashlight too. There is lot of flashlight / torch applications in Android Market, TeslaLED Flashlight is one of them. It is designed and tested working on Nexus One, Nexus S, Droid, Droid X, Droid 2, Droid Incredible, Desire, Evo, MyTouch 3G Slide, T-Mobile G2, Galaxy S Epic and Fascinate.
TeslaLED Flashlight works as standalone application. Supports strobe, timed and SOS Morse Code mode. And it can be used as widget too.
Search for ‘TeslaLED Flashlight’ at Android Market to download it.