The Supernatural Books
Everything is in here, from the racist truck to me having sex. I'm full frontal in here, dude.
These books are a series of novels, based on the actual events in Sam and Dean's life as revealed to Chuck Shurley, aka Carver Edlund, a Prophet. The books have been published by "Flying Wiccan Press: Publishers of Quality Science Fiction and Graphic Novels" run by Julie Siege The Publisher, although they are now out of print. Castiel tells Dean that these books will one day be known as the Winchester Gospels.
Every book title is an episode title: #1 Supernatural, #2 Wendigo, #3 Phantom Traveler, #4 Bloody Mary, #5 Skin, #6 Hookman, #7 Bugs, #8 Home, #9 Asylum, #10 Scarecrow, #11 Faith, #12 Route 666, #13 Nightmare, #14 The Benders, #15 Shadow, #16 Salvation, #17 Bloodlust, #18 Croatoan, #19 Heart, #20 Sin City, #21 Fresh Blood, #22 Mystery Spot, #23 Jus in Bello, #24 No Rest for the Wicked. This list excludes portions of season one and most of seasons two and three, although Red Sky at Morning and Time Is on My Side, are specifically mentioned as having been published. . Crowley is seen with a copy of the supernatural books in order for him to find every person Sam and Dean has ever saved and kill them so that they stop their efforts into closing the gates of hell. 
Chuck later tells Sam and Dean he has a backer who will help him publish more books, but Sam suggests in no uncertain terms that this would not be a good idea: "we have guns and we'll find you.".
The last book Chuck is known to write is "Swan Song" although as he disappears when he finishes writing it, its unknown if it is ever published.
I also found this series of books by Carver Edlund. Did those books really happen? Wow, that is some meta madness. Thanks for saving the world and stuff. Sorry you had zero luck with the ladies
Charlie Bradbury tells the boys she has read all the books in her quest to learn about hunting. When she commiserates with Sam about hsi poor "luck with the ladies" she demands of Dean that they burn all the books. Charlie informs them that will be useless as the books are now online. She also indicates that all of the books were indeed published as she is aware of Sam and Dean saving the world.
Sam and Dean discover the existence of the books while on a case - the Comic Shop guy tells them the books have a 'cult following.' The Winchesters discover an online fandom for the books, including Slash fans. They visit The Publisher, and pretend to be fans of the books in order to track down the author - Chuck Shurley. Castiel reveals that the author is a Prophet who forsees events in the boys life, and that he is guarded by an Archangel (later events suggest this is Raphael.
Chuck contacts a fan of the books, Becky who is in the middle of writing some Wincest and reveals that they are not fantasy but fact. He gets her to deliver a message to Sam and Dean, not knowing that the message is a false prophecy set up as a trap by Zachariah.
Becky invites the boys to a Supernatural Convention organized around the fandom for the books. After the Convention, Becky remembers that in the book 'Time Is on My Side', it was revealed that Bela gave the Colt not to Lilith, but to the demon Crowley, giving the boys hope that they might retrieve it and use it against Lucifer. Chuck says he has a backer who will help him publish more books, but Sam suggests in no uncertain terms that this would not be a good idea "we have guns and we'll find you.".
Chuck writes the final Supernatural book.
When Charlie Bradbury visits Sam and Dean, she reveals that she has read the books. Sam decides that they must burn them all, but Charlie tells them that the books have gone onto the Internet so that will be impossible.
Crowley is using the books to help research people Sam and Dean saved and then kill them, in order to get the Winchesters to stop the completion of the third trial which will close the Gates of Hell forever.
The Supernatural books act as a metafictive device in the text - that is they allow the writers to make commentary on the actual Show, its writing and the fandom. It is an example of is an example of breaking the fourth wall. See also Meta Episodes
- The character is also an avatar for Eric Kripke. Source - Rob Benedict talks about Chuck as Eric at Salute to Supernatural Chicago 2009
- Carver Edlund, the pen name used by Chuck Shurley, is an amalgam of the names of Supernatural writers Jeremy Carver and Ben Edlund. At one point he asks Sam and Dean if "Phil put them up to it," possibly referring to co-executive producer and director Philip Sgriccia. The publisher's name was Sera Seige, named after writers Julie Siege and Sera Gamble - as mentioned in this interview by Sera Gamble.
- Chuck refers his book about the books about "ghost ship" (3.06 Red Sky at Morning) and Bugs (1.08 Bugs) as "bad writing." Episodes Eric Kripke himself has said that are among his least favorite episodes. Supernatural: The Official Companion Season 3.
- The Supernatural fandom features many characteristics of the real fandom, including fans being critical of specific plot points Dean Girls, Sam Girls. Fan fiction is referenced when Dean discovers Slash, and Wincest. Becky runs a website called morethanbrothers.net and also writes Wincest.
- The possible revelation that Chuck is god, is commentary on the role of the writer, first referenced when Chuck refers to himself as "a cruel and capricious God" in regards his characters. See the entry on God for a fuller discussion on whether Chuck was in fact God.
- Posters for the books were included as liftouts in the The Essential Supernatural: On the Road with Sam and Dean Winchester
- For the Supernatural tie-in novels published in the real world see Books