One more help to subs is to 'hire' classroom help. I have students fill out a job application once each month or each quarter. They apply to be teacher's aide, messenger, new kid helper, clock watcher (when I am reading a book aloud at the end of the period, this person lets us know when time is gone), librarian, and one very popular job -- overhead washer. I leave these names for the substitute on posted cards. I ask the substitute to ask these kids for help, and they are usually eager to be helpful to the guest teacher since they have ownership in the running of the classroom.