TOD:
Stephen King is one of my favorite authors. Of the films adapated from his novels, my favorites are:
The Dead Zone
Carrie
Stand By Me (adapted from King's short story "The Body")
Misery
The Shawshank Redemption (also adapted from a short story)
Thinner
It and It2
The Green Mile (thanks for the reminder, DR John G.)
TV Movies I liked:
The Shining (original with Mollie Ringwald and Gary Sinise)
The Langoliers
Salem's Lot (David Soul and Lance Kerwin)
It (the version with Richard Thomas)
I concur with Bruce's assessment of "Hearts of Atlantis". It just misses the mark they were shooting for. There is a hint of what could have been greatness, but it totally misses that.