A very good friend of mine Adele Walsh is the Program Coordinator at the Centre for Youth Literature as part of the State Library of Victoria. She has a particular passion for Youth Literature (YA) and she has written a piece about encouraging reading in older children, when they have moved beyond younger picture books. It is a quick read and I think it's actually a very useful article if you are finding it difficult to engage children in reading.
You can find the article here.
You can also read more from Adele in her Read Alert blog.