Helping Hands! I love ours, though, because we paint their hands the 1st week of school and stamp them on white paper. I always making at least two so that I can laminate one for the Helping Hand at circle time and the other gets to go home! Helping Hands is a fantastic tool to use at home once they are used to the routine at school :)
Quiet Critters - They live in a soundproof jar only come out when it's quiet. They don't like a noisy classroom! During quiet work time you can pop one on each student's desk. If they are noisy you can move the critter to the side of their desk as a warning. If they continue to be noisy, the critter is returned to the jar. At the end of the lesson, whoever still has a critter on their desk can change it over for a sticker, points or other incentive.
How this teacher manages: instead of having classroom jobs, she had a boy and girl "helping hand" of the day. The two helpers were responsible for all of the classroom jobs (line leader, door holder, running errands, etc.) Just write each students' name on a cutout of a hand and hang the hands on the wall and flip the hands each day. It is such a super easy system, and it works out so that students get to be a helper about once every other week.