Yeah, I saw a few people mention Farscape and I wholeheartedly agree here. I absolutely LOVE that show (Note: Not past tense lol). And yeah, that was in no way finished - I know, they did the Peacekeeper Wars, and it was good BUT it wasn't enough to satiate the need for more.
If I recall correctly, I believe the writers et all commented that what they covered in PW was actually what they wanted to spread across an entire season - Which is disappointing because that would've been a kick arse season.
Also another one is indeed Futurama. I'm not sure, I'm not really in the loops here, but I was of the belief that the only Futurama in the immediate future was just the episodic format of the four movies? I mean, hell, I'd love to see more, but that's what I'd heard in the past.
More Futurama and more Farscape!