Our T'Whitt'er wall...yes, I know it's misspelled. Our school's name is Whitt. Each Friday the students must write a "tweet" about something they learned during the week. This is their exit ticket from my room each week This is also helpful for departmentalized classes. Everyone's tweets can be displayed instead of picking and choosing student work to hang out in the hall.
Classroom organization / Transportation Display - Know each day where your students will be going how your students are getting home. Since you use clothespins it can be changed each morning and with one glance you and the students will remember.