How do you organize your classroom to maximize student learning and minimize distractions?

What systems do you use to keep track of assignments, materials, and student progress?

I would like to set up a dedicated space in my classroom as a science area. What should I include?

Last year, I had a bulletin board up outside my door with questions for each grade level. Since moving rooms, I don't have as much room outside my door so I was looking for some ideas on how I can engage students. I was thinking of doing some of these boards with questions. I love the idea of them proving me wrong -- that was the premise of what I did last year too. Have you used something like this before? Any suggestions or tips? (It probably goes without saying, but I will say it anyway, this is not my photo.)