The only thing by Neil Gaiman I've read before was Good Omens: The Nice and Accurate Prophecies of Agnes Nutter, Witch, his collaboration with Terry Pratchett, and I really liked that one. I borrowed The Graveyard Book from a friend and I think it was a wonderful read. It's clever and touching, too, at times, especially at the beginning and near the end. 
 In The Graveyard Book, Nobody 'Bod' Owens's family has been murdered and he has been taken in by the ghosts living at the nearby graveyard. They teach him everything they know, including some 'ghostly' magic, as he explores the graveyard and, later, the world of the living. Bod makes friends, goes to school, learns a lot of life lessons by being disobedient and discovering the rules are there for a reason, and grows up into a young man; but the murderer of his family is still after him and once he discovers this, Bod is determined to avenge his parents and sister. 
 Loosely based on The Jungle Book, some similarities can be spotted, but The Graveyard Book is definitely a story in its own right. Gaiman's writing style is witty, quick, and easily readable, with things hidden between the lines that you might not get right away or that not everyone might understand at all, but that are very clever if you do see them. I really liked this and I'll be looking out for more Neil Gaiman books to read!