Let me start with saying that I'm glad I saw the movie first. It was NOTHING like the book. Okay, the characters have the same names, Ella is
Don't get me wrong. I'm not bitter. Really, I'm not. I just don't like it when they make movies "based on" a book and then change everything about it. Why don't you just come up with a new title too? I mean really. Did anyone see Cheaper by the Dozen? Cute movie, but it would have been cuter if they had a different title and not claimed association with the book.
But back to Ella Enchanted. I loved the book. And I agree that it needed little more plot action to make a captivating movie. But other than that, I say read the book. And don't expect it to be like the movie. In fact, pretend they aren't really related. It's better that way.