Ah, the science fiction "babe". An elusive creature, if there ever was one -- though that trend finally seems to be changing in film and on TV (thanks, Joss!).
Still, Flixster recently posted an article called 'Science Fiction Film Babes Through Time' that lists five decades worth "babes" in order of "babe-itude". It's a fun read. And though I don't know a couple of the women listed there, in my opinion, their list is pretty accurate.