Anytime a kid's movie comes out that was a book originally I don't allow my kids to see the movie. At least, not until we have read the book. Often times kids get down about reading. When my kids do this I use watching the movie as an incentive. Instead of them complaining about reading they can't wait to finish the book and will actually ask me to read them another chapter.
Some ideas to get you started are:
Diary of a Wimpy kid - Right now there are 4 books out, but the next one comes out at the beginning of November. My kids think these books are hilarious. They read them over and over. They loved the movie too.
Ann of Green Gables - I am unsure of how many of these books were made into movies. I know the first 2 in the series are definately movies. Also, for younger children you can get a children's version. I found one at WalMart for $5 and it was a hardback.
Star Wars - there are tons of these books and they come in various reading levels