The beauty of this is with iOS 5 you could even set up a class iCal Calendar and share it so that everybody could get the same notifications. If you wanted you could even share it with parents as a helpful reminder of when major assessment tasks are due - I'm not sure I would do this with everyone but for your really disorganised students it could create a whole lot less stress for everyone.
So what if your students want to do more than just iCal. What are some of the other apps that might assist a student or that you might suggest to a parent with concerns about their child organisation skills. These apps are not going to solve every problem but they might motivate some of your students to use their iOS devices or iPads to help get themselves on track. Many of these apps do more than just record homework or assignments - they also kept track of timetables and some can record course notes. Others are for the those students who might benefit from flashcard learning.
Flashcards Deluxe: $4.99
Searchable listing of your cards that allows you to easily look up other terms as you study.