We have a forget-me-not file. During the day we have a class recorder write down what was done in each class, list the homework and collect handouts for the number of students who were absent. I copy this form at the end of the day as well as any notes that were taken by the students for the same number of students absent and put it in a file for that day of the week. When the student arrives back at school she/he just walks over to the file and checks each file for the days she/he was absent. Everything needed to make up work is in the file.