Lesson Plans from the Folger Shakespeare Library — These lesson plans tend to be short and peppy, with things for the students to do. Also, all handouts mentioned are available as PDF downloads.
Miscellaneous Lesson Plans — Includes everything useful and free from the first 50 items returned on a Google search for "Romeo and Juliet lesson plans." Sometimes you will find a complete lesson plan for a unit on Romeo and Juliet, but most of the sites offer bright ideas for getting the students interested, or just lists of questions and essay topics.
Trackstar Sites — These are teacher-generated lists of links, with the teacher's notes to his/her students about what they should find on the linked-to sites.