Check out the teachers' site at PBS.org for lesson ideas. The lesson plans make great use of the network's programming, and can be used to support a wide variety of classroom topics. You can search by program title or content area. Some samples...
Talking about poetry, contemporary art forms, or hip hop? This lesson could start some unexpected discussions.
This lesson uses the Faces of America series to examine historical immigration in the United States, and serves as a basis for understanding contemporary anti-immigration sentiments.
Look around and see what you like!