One of my favourite books when growing up was The Changeover by Margaret Mahy, I have always believed that it would make a great film, with strong lead teenage characters, witchery, monsters and a battle against evil all against the backdrop of a normal New Zealand town.
I live in hope that the screenwriters wouldn't try and add too much to it - because it's not a simple story by any means - but I know that Hollywood likes to complicate things and make them 'better' so while part of me wants it to be adapted and another part - the purist part - would like it left totally alone.