I saw an announcement yesterday that Natalie Portman has been cast as Elizabeth Bennet in the film adaptation of Pride and Prejudice and Zombies, a book I haven't read yet, but was recommended by Inker Kirk.
Thinking about film adaptations of novels or other literary works, it seems to me a rarity to find one that can be enjoyed on equal par with the original, so I've started a short list, if you'd like to contribute. I'm only including examples where I read the book and saw the movie. For example, the Lord of the Rings films should probably be here, but I never read the books (I know, a sacrilege).
Good adpatations: BBC's version of Pride & Prejudice; Gone with the Wind; Harry Potter & the Sorcerer's Stone; To Kill a Mockingbird; Bridget Jones' Diary; Romeo & Juliet (both the Zeffirelli and Baz Luhrmann versions); About a Boy; Howard's End; Sense and Sensibility
Bad adaptations: How the Grinch Stole Christmas (Jim Carrey version); Harry Potter & the Half-Blood Prince (I was disappointed they left out the backstories of Tom Riddle and Snape); Twilight; Bridget Jones: The Edge of Reason; Da Vinci Code