i have recently finished the novel "nightfall" and i really like it. though it is written in colaboration with silverberg, the style is very asimovian. i like the finish too, the reporter find out that kalgash will pass through the barbarian times that come with the eclipse better and faster if the planet will be under the authority of the religious group Apostles of Flame.
i'm going to read the other two novels written in colaboration with robert silverberg: the ugly little boy and the pozitronic man.