Stargate SG-1: Okay, if a bit predictable. Haven't I already seen this episode? (Oh, wait that was on Star Trek - or maybe it was Red Dwarf....)
Stargate: Atlantis: What the hell---? Music by alien survivors from Atlantis (in another galaxy) sounds a lot like 21st century Celtic Fusion. Where did they get the synthesizers? Stargate: Atlantis has been getting better lately, but this episode was a huge stepback.
Battlestar: Galactica: It's taken me a bit to absorb this one. BSG is the best show on TV right now, period. Lost is a close second, and 24 an even closer third, but BSG beats them all. This is a show that takes its stories seriously. There isn't an ounce of fat on the stories, and the dialogue is terse, with nary a wasted word in sight.
Politically, BSG is either all over the map, or not on it at all - in either case, it's a perfect example of what happens when the storytellers care more about telling great stories and producing art instead of pushing an agenda. More TV shows should follow this example.
Becaue of this, I doubt there will ever be "a very special episode" of BSG. And that's a good thing.