MacDevCenter.com: Scheduling Tasks in Panther by James Duncan Davidson:

"Computers are all about automation of tasks, and Mac OS X gives you several tools to help execute tasks at certain times of day and even on a regular and repeating basis. After all, if you want to copy a file from one place to another, or download a set of web pages at 5:25 a.m. on the dot, why should you have to get out of bed when the computer can do it for you?"...