Author Sir William Golding's web site: http://www.william-golding.co.uk/
PowerPoint with introduction to book:
Did you forget your book at school? Well, no excuses needed, check out this online book.
Spark notes complete with chapter summaries, quiz, video, etc. A complete way to check your reading comprehension, but don't watch video until you've read the book. http://www.sparknotes.com/lit/flies/
Another teacher's awesome web site with chapter quizzes for close reading. Test your skill: http://www.dukeofdefinition.com