In the book Cell, there is a character named Alice, much like the Alice in the town of Tull from "The Gunslinger". Later on in Cell, a couple guys in an SUV drive by and toss a cinder block which strikes Alice in the face, nearly caving her face in. Now as you might recall from The Gunslinger, Alice had a huge scar across her face. Cell was the first book by Stephen King that I read, and The Gunslinger was my 2nd, so i immediately made that connection.

The reference to Charlie the Choo-Choo (the ride) is apparent as the Raggedy Man's clothes hang at the end of Cell. Charlie the Choo-Choo is also the name of the book that Jake receives in book III (The Wastelands) of the Dark Tower series describing a soon to meet, Blaine (the pain).

When Johnny plays the Wheel of Fortune, the last number he bets on is 19, which of course is featured extensively in the Dark Tower books. After dropping off Sarah at her house, Johnny calls a cab and it mentions driving up "Flagg Street."

At the very beginning of the novel, when Entragian stopped Peter and Mary, a small bag with Marijuana is found. In that moment, Mary remembers her sister-in-law who has married a guy called Roger Finney. Means something to you? Yeah, thats, in my opinion, another name for Randall Flagg. And in addition, the bag has a small sticker of Smiley, just as Flagg has in his jacket.

Mr. Gray: "What is 19, besides a prime number?"

Need I say more? How exactly does this DT number show up in Jonesy's mind? King did start writing this one in 1999. Mayhap 99 shows up and I missed it somewhere.

    There are several references to the Dark Tower Series. Edgar refers to himself as a "gunslinger" (pg 433). One of Edgar's major works is "Roses Grow from Shells." His ex-wife tattoos a rose onto her breast. Roses are also mentioned several times in the novel. The main antagonist wears a red robe similar to that of the Crimson King. His daughter's name ( Ilse Marie Freemantle) has 19 letters in it. Edgar's E-mail is EFree19 and his real estate agent's is SmithReality9505, both of which have numbers the amount to 19, which constant readers will recognize. Along with these other "19's", the first big storm (or "Alice") occurred in 1927, which when added together makes 19; and the flight he takes to Florida is flight 559. Pam's room number is 847 which added together is 19. Edgar's artistic abilities seem to parallel those of Patrick Danville, especially the ability to remove things from reality by drawing and then erasing them. Nan Melda loses two fingers on her right hand on a beach, which also happens to Roland Deschain at the beginning of the Drawing of the Three. Charley the Lawn Jockey (pg 568) shares the name of Charlie the Choo Choo, and the root "char," meaning death, also echoed when Edgar thinks about having people sit in the "char" when he has to think sideways to mean "chair". In one passage of the book, Edgar compares life to a wheel, in the sense of always coming around to the beginning, one of the main philosophies of the Dark Tower. The idea that drawings or paintings can change reality is another recurring motive.

Edgar Freemantle's daughter is going home on flight number 559. If you add the three numbers together (5 5 9) you get 19, which is a prominent number in the Dark Tower series. This could be a possibly intentional connection.

Look at the hardback Expanded Edition of "The Gunslinger" Page 7, Lines 28 and 29 to find this quote: "It spoke of a man who might straighten bad pictures in strange hotel rooms." This is not new to the Expanded edition as this same sentence is found in the previous edition of "The Gunslinger", just look in the limited edition hardback by Donald M. Grant (third printing 1998) put in a three book box set edition on Page 14, Lines 16 and 17.  Now go to the story "1408" first put out in the audiobook of "Blood and Smoke" and printed in "Everything's Eventual" copyright 2002.  I refer to the Pocket Books printing of January 2003 on Pages 488 and 489.  On Page 488 Lines 18 and 19 say, "What Mike had noticed at that point were the pictures on the walls."  Same Page, Lines 24 and 25 say, "All three pictures were in glass frames and all three were crooked."  Finally, on Page 489, Lines 5-7 say, "Although he was not ordinarily a fussy nam, he circled the room, setting them straight."  These are exact quotes and considering the finality of the story called "1408", I'd say this is a definitive "Dark Tower" tie-in/reference.

In the short story, Lunch at the Gotham Cafe, Guy, the maitre'd, screams "eeeeee!" in his ranting. The Crimson King does the same from the Dark Tower at the end of the title book.

In the Dark Tower VII, after Susannah woke from her first dream of Jake & Eddie in Central Park after their death, this, in parentheses: "(this is NINETEEN all of your friends are dead). Seems similar in content to what Mike Enslin hears coming from the telephone in room 1408: "This is nine! This is nine! Nine! This is ten! Ten! We have killed your friends! Every friend is now dead! This is six! Six!" The voice continues, shouting different numbers, but curiously enough, the highest number it ever reaches is eighteen.

From Song of Susannah:

it talks of rolands grandfather who went to Garlan to slay a dragon and was to late it says "No, he was to late. The last in that part of the world had been slain by another king, one who was later murdered." King Roland in the eyes of the dragon killed the last dragon in garlan

In the Langoliers, the passengers in the plane fly through something very similar to a thinny. Additionally, when traveling back through the rip and experiencing the birth of the world, the pilot twice mentions that it feels like a beautiful rose slowly opening.

Well, I think that the connection has to be with "Little sisters of Eluria". In both books, there are some strange powers related to healing. In Little Sisters of Eluria, Jenna (the only sister that is good) use insects to heal her patients. And John Coffey (the only prisoner that its inocent) can heal too, and when he does it, some insects appear. Maybe he knows the secrets of the Little Sisters.

"The janitor who saw them later identified the man as Raymond Fiegler, head of the MSP. He identified the young woman as Carol Gerber." A man with the initials RF was the leader of a student protest group that set off a campus bomb and killed people. Randall Flagg was known to go by other names, usually with the initials RF. Also, on page 516, Carol says, "I'm good at not being seen," she said. "It's a trick someone taught me a long time ago. The trick of being DIM." Walter sometimes was called Walter O'Dim, for his ability to fade into the background and not be seen. Walter and Randall Flagg were later discovered to be one in the same. This shows that Carol had run ins with both the good (Ted) and bad (Walter/RF) forces of the Tower.

These are probably too obvious to point out, but twice Bobby Garfield refers to "other worlds than this." The first time it's a direct quote from Jake's line when he falls in the mines in The Gunslinger. Also, there's an interesting parallel structure between the two plots that I assume must have been intentional - both Ted and Roland play a sort of adopted father figure, pretty damn near explicitly, to Bobby and Jake. Jake says this line as Roland is about to lose him, whereas Bobby says it when he's about to lose Ted. In a way, though, the loss is identical, since Ted is removed to the keystone world leaving Bobby in a "normal" one, whereas Jake went to a normal one leaving Roland in the keystone world.

The turtle mentioned in the Dark Tower series is, of course, the Turtle from It, that helps Bill and the others when they are facing It's real self

From The Waste Lands:

Eddie and Susannah are on their way to the Cradle when the Pubes attack them (so to speak). Once they had killed a few the Pubes stopped but one guy urged them on. He's described as "...bald except for two fluffs of frizzy hair, one on each side. To Susannah, this fellow looked like Clarabell the Clown; to Eddie he looked like Ronald McDonald..." In "It" (also from signet, on page 12) George sees Pennywise in the drain and thinks that he looks "...like a cross between Bozo and Clarabell..." and says that had he been alive a year later, "...he would have surely thought of Ronald McDonald before Bozo or Clarabell." And Pennywise is described as having "...funny tufts of red hair on either side of his bald head..." I belive that the man in the mob who Eddie shoots is Pennywise, or a version of him.

The Crimson King's true form is said to be a spider, like Mordred Deschain. In Stephen King's IT, Pennywise's truest form we see is a spider, his greatest enemy is the Turtle, as in Maturin the Turtle, and can shapeshift, suggesting that the Crimson King and IT are of the same race.

Henry gets picked up by a 1958 Plymouth Fury ( obviously Christine ), driven by the dead Butch Huggins. This alludes to Christine being controlled by Pennywise, who has some sort of connection to the Tower, and Roland's universe. It may explain what actually did control Christine.

On page 196 of "just After Sunset" in the short story N. the OCD pateint is describing his counting problem and mentions the number 19. mentions it to be a powerful and bad number.

"Divide 3728 by two and you come out with eighteen-hundred-and-sixtyfour. 1864 adds up to nineteen, a powerful odd number. powerful and bad."-just after sunset

What N. sees in Ackermans Field could be a speaking circle. He talks about the field seeming thin, like at any moment things from other universes could come spilling out.

the monster cthun coming out of the ring of stones and the mention of other worlds

IN WIZARD AND GLASS THE PHRASE "BOOL THE END" IS USED THROUGH OUT Lisey's Story

As Ray wins, he is in a severe degenerative state of mind - he sees a "dark figure" beckoning him to continue walking. The dark figure could possibly be Randall Flagg, as he is usually known as both "the Walking dude and the Dark man." Shortly after even though he was fatigued he gained the "strength" to run. The entire route is going in a south west direction, almost perfectly like a path of one of the beams

when asked by ace or the young doc who is sold the pipe,where he comes from,Mr.Gaunt tells him the plains of blaine

the 10 o'clock people is about the vampires from the tower books

Very subtle connection, but when Rachel is driving back to Ludlow she passes a sign for Jerusalem's Lot. Of course 'Salem's Lot introduces us to Father Callahan who we also meet in Calla Bryn Sturgis!

Not only are the Regulators another name that Ted uses for the Low-Men, I also believe that the "Sinister No-Face" from the Regualtors book is another apparition of the man in black,walter odim,marten broadcloak,randall flagg,ect...

In "The Waste Lands", Co-Op City is mentioned.  Co-Op City is the city where "The Running Man" is set.

Dick Hallorann appears in The Shining and in It, and of course It has multiple connections to DT.

Mother Abigail in The Stand makes a subtle reference to the power known as shining ("My own grandmother used to call it the shining lamp of God, sometimes just the shine." )

"The Raft" definitely contains a connection to Dark Tower. It appears that, much like The Mist, something from Roland's world has come through to ours. An image of the man-eating blob was what came to my mind the instant I read about an army of men devoured in the thinny outside of Mejis.

Now, I am not sure if this is a stretch, and I only include it because R.F. is also Walter in The Dark Tower series. In The Stand, R.F. gives black rocks, which in some cased are also things the person really needs. You may already see my connection here. After giving them these needed things, he has this power over them... Needful Things.... Sounds very familiar right? I know it is not exactly the same, but very very similar.

The villain in Storm of the Century is named Andre Linoge.  It is pointed out in the book that this is an anagram of Legion, which is the true name of the Ageless Stranger according to Walter at the end of the Gunslinger.

Also, on a smaller scale, the townsfolk of Little Tall island tend to use radio channel 19 to contact each other.

This is the scene where Jack is in the Agincourt Hotel, and he is fighting the last of the knights. He is describing his surroundings as he is flipping through a vast amount of worlds, and describes seeing a great many people who "were beautiful but doomed, and so ghosts always seem to the living." This is very similar to when Roland is climbing the Dark Tower in the last book, and sees on each level different people in a similar fashion, both those he had known along the journey and those he had not, and were described as almost ghost like.