Do not forget the other young adult fantasy series on which they have also made at least one movie. That's His Dark Materials. http://en.wikipedia.org/wiki/His_Dark_Materials

Cannot say I liked these as much as the Harry Potter series nor the Lord of the Rings series but they are kind of fun if you like a sampling of say Andy Rooney to go with your CS Lewis. I mean in the guise of Rooney's opinions on religion.

I am not familiar with it but there seems to be a vampire series of books for young adults that is also very popular right now with the youth???