The kids at my school all use planners, with a page for each day that has a space for each subject. They write down Monday's assignments on the Monday page, and so on.
I guess I don't really understand this system. Once Monday is over, they turn the page and it's like Monday never existed. For any assignment that's due later than the next day, how does this system help them remember? If the lab report was assigned on Monday and due on Thursday, how does the planner help them remember it? Nobody seems to write anything on a monthly planner or anything long range.
I prefer to just have a simple list of things to do (these days on Google Docs), with due dates noted beside them. That way I can see everything that's due. In addition to the master list, I put each of the items on a different document with categories of of Do Today, Do This Week, and Do This Month. It works pretty well.
Anyway, no real point to this except to say that I think the daily planners are not super user-friendly for kids, but that's the type of student planner I see in every store.