Animated timers that you can put on the projector. Gives students a visual for the time they have remaining. Plus a fun surprise (noise cue) when time is up! :) Sometimes kids just need the visual rather than a timer on a desk.
dislike having long lines of students waiting for me to edit their papers, I have them put their numbered clothespins on my clipboard so that I'll know who is ready to go. This would also be great for students waiting to take AR tests!