I teach third grade and went up to 30 students this year. Organizing their papers for return used to be a hassle with only 20 and made me really look at options. This expanding folder works perfectly. Each child has a slot and I use 31 for no name papers. I can take it home and put corrected papers in it and then just bring it back to school for them to empty their "mailbox slot". You should advertise this to all teachers and maybe make one with 36 slots for larger classes!
I use it to keep track of work on a daily basis through out the month. I check the date every morning to see what needs to be done for that day. If I don't get to something I just move it to the next day. It could look a little more attractive different colors maybe. I have to hide it under my desk.
I use the organizer as a "tickler file" a reminder for work tasks that need to be completed at a future date. Once the future work task is off my desk it is off my mind and doesn't reappear until I actually need to complete the task and items don't get lost on my desk. I use the 1-31 organizer with the retrieval date placed on the document by me. Later months are inserted behind the earliest month for each day 1-31. This allows for daily retrieval of items by my secretary and placed in my "in-box" yet everything is stored in a very compact space. I have used this system successfully for the past 15 years it works!