For as long as I've been at this school, one of the "big deals" has always been the Stats Project. Starting last year, that project has been mine.
We've spent the last couple of class days brainstorming questions and then winnowing down the list. Some of the questions are plain, some are on controversial topics, and some are just plain startling! Next week I'll send my students out into the other classrooms around school to random choose students and survey them. We'll collate all the data, and my students will have until Christmas Break to write up a report on the project.
It's a lot of work for all of us--certainly a lot of reading and grading for me--but it's a valuable teaching and learning tool.