I've seen some random complaints about the Auto Brightness feature, so I thought everyone would like to hear that the problems aren't imaginary. I placed my phone next to my friend's (both 3G w/ 2.0.1) and set the brightness the same. Then I turned Auto Brightness on on both phones. It made his phone dimmer (as it should, based on the room lighting at the time) and my phone twice as bright! I tried it multiple times around the room with the same result every time. Same phone, same software, same lighting in the room. So there's definitely something going on with the Auto Brightness feature. I wasn't sure if I was imagining it or not before, but now I'm certain.