TechTips Vol V OS X Lingon
Lingon is a GUI frontend to the OS X task Scheduler launchd. It allows you to schedule tasks to be run at specific times or at login. It can be downloaded here http://sourceforge.net/projects/lingon/files/
More in depth instructions
Some Uses
- Scheduled rsync Backup Script
- Change Time Machine schedule settings http://www.macosxhints.com/article.php?story=20080211194627629