I have seen flashlight applications before on my smartphone an HTC Desire which use the screen backlight. My phone software was recently updated with the 2.2 Android software Froyo, this came with a smart little flashlight app which uses the camera led to provide a flashlight with 3 different power levels. Should prove a useful addition to my phone.
May even delay me purchasing a single aaa light as an EDC.
Anyone with any experience of using their cellphone as a light in a tight spot?