Editing Class - new media ideas?

I will be teaching an editing course at TU in the Spring. I am always looking for ways to "freshen" the course material. Of course students have to learn to edit documents, but we are no longer talking about just printed newspaper columns - there is so much more out there today.It is a journalism class but many of the students will be marketing/pr majors or general liberal arts students...I teach the class in a computer lab so everyone will have access to the Internet etc.So, I am looking for suggestions on topics, textbooks, guest speakers etc....Thanks in advance for your suggestions!