PDA, it beeps to remind me when i have exams, assignments, projects, Its all color coded so I can look at a month and see whats going on when. It also can repeat events, so if you work a regular schedule or u have a bill due, the same day of every month, you can set the calender to that. Plus you always have it in the pocket.
You can't just remember your schedule anymore, theres too much to remember besides that.