Looks like my list has mostly been covered:
John Adams
Band of Brothers
From the Earth to The Moon (the episode on the building of the LEM is my favorite)
Dune
I thought The Stand was average, but there's no way it could compare to the book, would need to be 10 hours long...
The Shining 2 part series was above average, could have been better maybe if done for HBO instead of for basic cable, could have been a little more R rated like many parts of the book.
There was a 2 or 3 part (4+ hour) version of Moby Dick a long while back, I thought that was pretty good. Have to be careful getting it on DVD, there's a cut down 90 minute version as well as the full 145 minute one.
Of course Battlestar Galactica, twice. I liked the way the original started out, and loved the re-imagining that started out as a mini-series. Maybe I'm remember wrong, I thought the original started out as a mini-series then moved to series, but maybe that was later that they edited the first few hours into a movie...
That's about all I can think of for dramatic stuff.
There's some great documentary style ones:
When We Left Earth
Planet Earth
All those Ken Burns ones....