I know Farscape was cancelled, without notice, and ended in a cliffhanger. When that happened, I remember reading that the production company decided to try to resolve it with The Peacekeeper Wars and started production on that even without a buyer (and it was eventually aired on SciFi).
Did this bring the series to a satisfying conclusion?
(I've always wanted to watch the entire series, after seeing a few of the early episodes, but didn't want to read about or see what happened in the end because that would spoil it for me. I just want to know if it ends in a way that makes it feel complete. There's so many shows to watch now I don't want to get wrapped up in it if I'm only going to be frustrated by the end of the story.)
IMPORTANT Please remember to use spoiler markdown if you're including spoilers like @Izkata did in his answer -- remember, I have not seen more than a few episodes!