I love the Zinn Education Project and use resources frequently. The ZEP lessons, as well as the writings of Howard Zinn, have inspire me to depart from Eurocentric interpretations of history, textbooks, and dull sequences of lessons.
My favorite lesson thus far has been The People vs. Columbus.
Along with readings and a screening of Even the Rain, The People vs. Columbus allowed to students to approach the historiography of Christopher Columbus with a critical eye. Students loved the activity and were passionate in every phase of the lesson from preparation to closing remarks. Jurors not assigned to groups wrote thoughtful essays about their thought process in rendering a verdict.
Perhaps the best thing about the lesson was that it made all parties involved, including myself, step out of our collective comfort zone and face uncomfortable truths in an academically honest and beneficial way.