Here are a few more ideas for incorporating active and collaborative learning in your large courses.
Holly Grout: I use one-minute essays and think-pair-share activities in the classroom. GTAs hand out note cards at the beginning of lecture. I tell students to put their names on the cards for an attendance bonus point and then to hold onto the card until later in the lecture when we do the activity where a correct response might earn them another bonus point for the day. Students turn in the card to their assigned GTA at the end of lecture.
Margaret Johnson: I often assign group projects (a different project for each group) to enhance understanding of the material presented in class. For example, I assign questions about a specific research tool to help students understand how that tool is used to generate the scientific information presented in our textbook.