Battlestar Galactica - How It Ends
It's simply... amazing. The sort of script where, when you finish, you just fall back in your chair in a daze, then call anyone in the loop and spend hours talking about how satisfying and powerful and (pick superlative of choice)... usually I would be a little mindful of raising expectations or succumbing to excessive hyperbole, but that's not going to be a problem here. Of course, I've seen what's coming up for the rest of season four, and I think it's all mighty powerful stuff (not to mention exciting, heart-breaking, "etc."), but to know it all culminates in something so remarkable... well, the bar for great television just got notched up another level. No kidding.
If that doesn't whet your appetite, nothing will... me, I'm on pins and needles waiting to see the first dailies!