Official Thread: How Pretty Much All Of King's Work Is Connected To TDT.
We'll start with Carrie. She's obviously a Breaker. And Chamberlain is part of King Country.
Salem's Lot: Father Callahan, Type-1, Type-2 and Type-3 Vampires.
The Shining: This one is a little theoretical, but when the Overlook Hotel blew up at the end of the book, it said that a shadowy manta-like shape emerged from the burning ruin, much like what was described leaving Susannah after she had sex with the incubus in The Waste Lands. It's possible that the Overlook hotel was possessed by a creature of the Prim, one that was able to turn the hotel into a time-loop and trap its victims there indefinitely.
EDIT:
Night Shift: Jerusalem's Lot, goes without saying, and Night Surf takes place in the same universe as The Stand.
The Stand: Randall Flagg is The Man In Black Also, this universe is visited in Wizard And Glass.
The Dead Zone: Again, theoretical, Johnny Smith potentially a Breaker?
Firestarter: Charlie McGee, Breaker material?
Cujo: Takes place in Castle Rock, part of King Country, which is closely connected metaphysically to The Dark Tower.
Different Seasons: Shawshank Prison exists in King Country, The Body takes place in Castle Rock, and in The Breathing Method, the inside of the club where the story is being told resembles the lower levels of the Crimson King's palace, which lead to different times and dimensions.
More to come.
Come quietly, or there will be...trouble.