Children's Books Turning into Feature Films...

Three books I've read that have become feature films are:

Holes by Louis Sachar
Horton Hears a Who by Dr. Seuss
My Sister's Keeper by Jodi Picoult

Of the three books/films above, I enjoyed the book better in all except the Dr. Seuss movie. I think this is due to the fact that the other two had to be shortened in order to make it into a movie due to the length of the book. My Sister's Keeper was shortened and thing were left out that actually made a difference in the entire movie, especially the ending. I made the mistake of watching the movie first, and when I began reading the book it was completely different. They left out important characters, such as the court appointed worker, etc. Holes didn't leave out as much, but the book was definitely more informative and descriptive, yet left more to the imagination. In Horton Hears a Who, I felt that the book was so short that they had the opportunity to add to it when making the movie. It was an extended version of the picture book, but it only added to the plot/story...nothing was taken away.