4Practical Magic by Alice Hoffman. Nothing like the movie, but still completely enchanting.
3The Girl Who Chased The Moon by Sarah Addison Allen. I love the way Sarah Addison Allen writes. She's got three other book that are equally spellbinding and magical.
2Harry Potter (all of them) by J.K. Rowling. I've never seen a set of books bridge such a wide age gap before. These set of books remind us of the joy and adventure of being a child.
1Sideways Stories From Wayside School by Louis Sachar. I found this book in 1st grade and it was the first book I remember collecting. It set off a lifelong love of reading.