Took me a while to notice too, mostly because from the get-go we knew there were twelve Cylon models. When the Final Five were first mentioned, the rest had already been referred to as the seven models that are known (or at least I thought of them as such). Only when the fact that Sharon is Number Eight penetrated my mind did I realize the math was off. Must have been season three-ish, but I'm not sure. Watching basically all episodes in one go doesn't help me distinguish between seasons, much less separate one episode from the other.

Anyway. Gonna have to check out your forum and read up on the whole lost Number Seven angle while I'm waiting for the download of Deadlock to finish. Sucks to be here, occasionally. *sigh*