I have made an android application that replaces the shift calendar, called Shift Adder. If you have an android phone this app will add your shifts to the phone calendar. You no longer have to keep a shift calendar or card around to schedule appointments. The shifts are added as all day events on your calendar for up to one year at a time. Right now it only supports the 24/48 shift schedule.
What other shifts do I need to incorporate? 24/72? 24on/24call/48off? Kelly Shift?