Excellent article here on Harry Potter, CS Lewis and spiritual battle. Hadn't come across the 'Movie Ministry' website before.
On a similar subject, other good links on film and faith are:
http://www.licc.org.uk/ the London Institute for Contemporary Christianity, updated regularly, click on 'connecting with culture' for stuff on film etc.
http://www.hollywoodjesus.com/ thoroughly American but normally a good range of articles on interesting films and DVDs
http://uk.rottentomatoes.com/ film review site which puts every review of a film on a single page, and cooks up an overall critics rating for the film. My first point of call when investigating a new film.