Any guesses as to why Apple still hasn't put a brightness slider in either the notifications window or the multitasking tray? The iPad has one, so surely they recognize the utility. They have a volume slider in the tray, which seems redundant with the physical volume buttons. Why not make that a brightness slider instead? If auto brightness worked better, I guess it wouldn't be necessary. Unfortunately, as far as I can tell auto brightness only really works if you go into a bright room or outdoors, and is constrained by where you set the slider. If you like a real dim screen to read in the dark, you only get about 1/3 brightness in a lit room. If you move the slider to a higher setting, it seems like it won't dim all the way when you go back to a dark room.