I stumbled across this site from Classic Stage Company. They have this excellent PDF that goes over everything about Romeo and Juliet. It has a quiz to determine which character you would be, an illustrated timeline of Shakespeare's life, a visual layout of who loves and is related to whom in the play, what it was like to live in London during Shakespeare's time, notes on the play, a quick synopsis, and more. The illustrations are great and the content is spot on. Best of all, they say in the opening pages that it is free to reproduce for your class.
Here are two screen shots of their illustrated pages:
You can find the whole thing here: http://www.classicstage.org/downloads/rj_studyguide.pdf