Psyche in a Dress by Francesca Lia Block was kind of weird to me. I purchased it without having ever read it before because I need a few extra dollars to bring my Amazon purchase to $25. It's described as stories of greek gods in modern times, but it's even more disfunctional than I expected. But some people like that sort of thing.
Beauty by Nancy Butcher is a Snow White retelling that goes very much away for the original but does a great job talking about the obsession of Beauty and Youth and I liked it a lot.
Beastly by Alex Flinn (yes, the book the movie is based on.) I watched the movie first with a friend, then got the book. Then watched the movie again and yelled at it. ;) But I really like it. (Beauty and the Beast from the Beast's perspective, set in modern times, with teenagers.
Just Ella by Margaret Peterson Haddix. Cinderella after the Ball, but before the Wedding. I love this version and don't care it's for younger people.
Ella Enchanted (Cinderella, only SO MUCH BETTER) and Fairest (Snow White) by Gail Carson Levine. I also like her short fairy tale retelling series, The Princess Tales.
Spindle's End (Sleeping Beauty) and Beauty (Beauty and the Beast) by Robin McKinly
Spinners (Rumpelstiltskin) and Zel (Rapunzel) by Donna Jo Napoli-these are REALLY, REALLY good. Zel retains quite a bit of the original's darkness, and gets into the mother-daughter type relationship they have.
Scarlet Moon by Debbie Viguie (Red Ridding Hood) WARNING! This book got me pregnant with child #2. Okay, not really, but it is a romantic story. And it has some darkness. And , *SPOILER* Werewolves and Knights from the Crusade.
Just about anything from the Once Upon a Time series (not the TV show.) They use various authors, but they retell ALL of the classics in different ways. I own.....several of them.