At least this cover doesn’t make me want to devote another 500 words to critiquing it.
You’d be forgiven for thinking that Diana Wynne Jones cribbed from Disney’s 1992 Aladdin, but Castle in the Air came out first (in 1990). Perhaps more strangely, I haven’t found anything about the making of Aladdin that confirms that they were inspired by Castle in the Air… but I wouldn’t be surprised if there was some cross pollination.
Howl’s Moving Castle is an excellent book. I’m indebted to my friend for recommending it to me; I knew the book existed, and I already loved the Miyazaki film, but it was her mention of it that finally pushed me over the edge.