A video from Bozeman Science where Mr. Anderson discusses why it is imperative for biology teachers to discuss the theory of evolution. This video really does a great job of convincing teachers that they need to talk about this.
A groundbreaking book by microbiologist Ken Miller from Borwin University. In this book he discussed that there does not have to be a divide between religion and science and that he, as a very religious Christian and evolutionist, can live with both sides. This book is a great way to open up student's minds, especially those who doubt evolution.
Another article from the National Center for Science Education about the efforts that have been made to prevent the teaching of evolution and the inclusion of creationism/intelligent design in public schools. This is a very useful page to get started in one is facing this battle. There are many linked resources for additional information.
An article from respected evolution advocate Eugenie Scott from the National Center for Science Education. She outlines what can and cannot be done by teachers when teaching the subject. This article was very helpful when trying to decide which path to follow in the classroom.
A very complete and useful collection of links to sources about the controversy of teaching evolution in public schools. The links take you to resources that explain why evolution is up for discussion, what the law says about it, and what some current efforts are to get it included/omitted from various curricula.
This video shows a debate between Bill Nye and Ken Ham, the director of the Creation Museum. They both present their arguments as to why evolution and creationism should be accepted. Bill Nye does a much better job (he is presenting facts, after all) and sows why evolution is really the only thing that should be taught in schools. I think this video does a great job showing how a "hard subject" is not really all that hard.