[jimfun]

Yep, it does. Look at the front of the phone, top, where the headset speaker is (where your ear goes when you talk). In the oval slit, on the left side, you'll see a small (3mm) piece of what looks like clear plastic. That's the light sensor used to turn off the screen when you put the phone to your ear when talking (stock ROM function). That's the same sensor that controls the screen brightness. You'll notice this if you power on your phone outside in full sun; for a moment the screen will be dark and then "jump" to full brightness when you can see it in full sunlight.