I have included a "Class Helpers" Header along with 24 job titles. I mount the job titles on library pockets and write the students' names on index cards, then place one index card in each library pocket. This year I am going to try changing the jobs once a month instead of once a week. This way the students really have a sense of responsibility for their job.
I have also included a picture of my job chart as a reference.
If there is a job title you are specifically looking for that I have not included, e-mail me at firstname.lastname@example.org and I will see if I can add it for you.
Click and Teach