Fallen by Lauren Kate

Well, Disney has optioned rights to the 'Fallen' Saga for filming...

http://www.hollywoodreporter.com/hr/content_display/film/news/e3i71b756a8035722a28d4dc267cb8ac788

EDIT: According to fallenbooks.com , the movie is in the pre-production process, and the movie is to be released in 2012. I doubt this because no official cast has been released, nor any trailers. I hope the movie is good, even though Disney has a bad reputation for making PG-13 books into G-rated movies with happy songs and dance numbers. *cringes*

Hope this helped!