After using the D90 for a few days, I’m very impressed with it. Live view is a lot better than I expected and I really like having dedicated buttons for settings like white balance, quality, and ISO so I don’t have to keep going to the menu as I did on the D40x.
This evening I tried using it in low light and I found that it performs beautifully at high ISO settings. All of these pictures were taken when it was almost completely dark and without a tripod. I shot in JPEG and didn’t do any noise reduction or other processing.
Taken at ISO 1600, shows very little noise.
Taken at ISO 2000, shows some noticeable noise but still looks good.
Taken at ISO 4000, shows quite a bit of noise but doesn’t look too bad. Passable at smaller sizes.