great debate going on over in a fark thread about it, with plenty of evidentiary pics :)...
(needless to say, being fark, and being fark'ers discussing women, the discussion gets a little raw at times, you were warned...)

the article the thread is about strangely declares jane fonda's barbarella the honor...

personally, my first choice would have to be milla jovovich as leeloo in the fifth element...
also on my list would definitely be zev (and xev) from lexx and padme, the star wars inamorata for this generation...
and, not that i have exactly sat and watched an episode of the show all the way through, but, as an honorable mention, gabriella from xena is cute...
and, though a video game, not only is space channel 5 unquestionably sci-fi (imdb agrees), ulala is unquestionably a sci-fi babe...


/haven't seen nicole kidman in anything sci-fi yet