I find that email is the perfect tool for sending sub plans to school when I am not able to go myself. I just email a friend who can print out the plans and take them with him/her in the morning. (Of course, I call first to make sure the friend is able to do it.) I already have an outline of my schedule and other permanent information on word processing. Whenever I am going to be absent, I just type in the current information. Computers make planning so much easier.