There are many, but the main plot revolves around "The Chronicles of Narnia: The Lion, the Witch, and the Wardrobe", "X-Men", "The Da Vinci Code", "Charlie and the Chocolate Factory", "Snakes on a Plane", "Nacho Libre" and "Pirates of the Caribbean".
The main plot and characters spoof "The Chronicles of Narnia: The Lion, the Witch and the Wardrobe".
Lucy Pevensie is a spoof of Sophie Neveau from "The Da Vinci Code". The opening scene of the movie is spoofed, with Silas being one of the main antagonists. Also, the movie spoofs the big revelation scene centered around the Last Supper, with Harry Beaver spoofing Ian McKellen's character.
Susan Pevensie is introduced in a spoof of "Snakes on a Plane". The groin bite, boob bite and Samuel L. Jackson are spoofed.
Peter Pevensie is a spoof of Archangel of the X-Men. The trilogy of movies as a whole is spoofed (and NOT just "The Last Stand"), with characters spoofing Wolverine, Cyclops, Rogue, Magneto, Storm and Mystique. Also, the movie spoofs the comics by having Magneto and Mystique on the team.
Edmund Pevensie is introduced in a spoof of "Nacho Libre", complete with characters spoofing Nacho and Chanchito.
"Charlie and the Chocolate Factory" is spoofed, with characters spoofing Willy Wonka and the Oompa Loompas. This part of the movie also spoofs the music video for Fergie's "Fergalicious".
The "Pirates of the Caribbean" movies are spoofed. The character of Jack Sparrow is spoofed as Jack Swallows, the White Bitch wears a Davy Jones mask and plays an organ, and the water wheel scene in "Dead Man's Chest" is spoofed.
The "Harry Potter" movies are spoofed, with characters spoofing Harry, Ron, Hermione, Hagrid, Dumbledore and Minerva McGonagall. The wart spell from "Order of the Phoenix" is spoofed, as well as the Invisibility Cloak.
Edmund daydreams of a scene that spoofs the rail gun scene from "Superman Returns", and the White Bitch's evil plan is the same as Lex Luthor's.
Chewbacca and the Stormtroopers from "Star Wars", Legolas and Gimli from "The Lord of the Rings", James Bond from "Casino Royale" and the pit crew from "Talladega Nights: The Ballad of Ricky Bobby" are all present in Gnarnia.
The photo camera scene in "Mission Impossible III" is spoofed.
Also, the MTV tv shows "Cribs" and "Punk'd" are spoofed.
The remote from "Click" appears at a crucial point in the movie.
Borat closes the movie, and during the credits we see a character dressed as V from "V for Vendetta", but with a Michael Jackson mask instead of a Guy Fawkes mask.
When the " White bitch makes her first apearance, The sled that she is in has license plate " Gnarnia Drift " an obvious refrence to "The Fast and the Furious: Tokyo Drift"]