Films and games helping to boost literacy?

This is an interesting BBC article suggesting that films and games adapted from books can help to encourage children (and I think for adults also) to read the original books - even if the books are challenging to read for their age group. 

This is certainly the way that I prefer to do it - watch the films first, then the books. With good stories, often the film has to cut back on a lot of the details, leaving viewers wanting more. The books help to fill these details and let the reader relive the story, and more closely savor the experience. Doing it the other way round however, then the viewer is often disappointed as the films often comes out different to the world they have imagined whilst  reading the books. 

Another problem with books is that often it's difficult to tell beforehand which books are worthwhile reading. Some stories can start-off very interesting, but fail to live up to expectation as the storyline continues. I like to be surprised with a good story in the cinema, then read up more about it to see how the original story differs from the adopted film- just a personal preference. What about you?