I, myself, miss data quite a bit. He's absence is extremely felt in the TNG post-nemesis books. A side note on Worf; i thought it was established in DS9 that Worf would never be able to command a starship. In the episode "Change of Heart" he chose to save Jadzia's life over completion of the mission. Didn't sisko say he'd make sure Worf could never command a ship? It's been forever since i saw that one, so i'm not sure if i'm remembering accurately.