Peter and I found it particularly difficult to recover highlights with D2x. In our experience this is different from all previous Nikon dSLRs, except for original D1. But noise in midtones and shadows with D2x is pretty low - up to 560 ISO. So, for now it looks like I will be exposing for highlights where I want to keep details. To me underexposure is when details are lost in shadows; and overexposure is when they are lost in highlights. Other things are to be solved via tonal curves (including in-camera curves). Dark pictures are not necessary underexposed - just midtones boosting curve is needed.