When I sub, I normally leave a note for the teacher about how the day went. However, I know a lot of subs who do not take the time to do this. If you want this type of information upon your return, have a form for subs to fill out at the end of their day. Ask for information on student behavior and if all of the lesson plans were covered. A sample substitute report form can be downloaded from the media gallery.
When I was teaching, I often said that being absent from the classroom is more work than actually going in for the day. Most of the list above can be prepared ahead of time and then left in the sub folder for the remainder of the year, so it is a one time deal. It may seem like a lot, but it will make returning after your absence must easier!