Photographers who own or have at least handled a Nikon D80 will instantly feel at home with the D90, as the new camera has the exact same dimensions and almost the same shape as its predecessor. D70 owners who gave the D80 a pass will, however, likely notice that the right-hand grip of these cameras is actually somewhat less comfortable than on the D70.
If you are finding that your little finger has a less secure place on the D90 than it had on the D70, consider purchasing an MB-D80 battery grip along with the camera. This is, by the way, the same vertical grip that fits the D80 too, so those who have already bought one for their D80 can use it on the D90 as well.
