Ever wished that some of the things in your "Startup Items" or "Shutdown Items" folders wouldn't be launched every time you start/restart/shutdown your Mac, but just once a day?
Throw the "Daily Startup" application in your "Startup Items" folder. The first time it's run it will create a "Daily Startup Items" folder in your System Folder. Whatever you put in that folder will be launched no more than once a day.
Throw the "Daily Shutdown" application in your "Shutdown Items" folder. The first time it's run it will create a "Daily Shutdown Items" folder in your System Folder. Whatever you put in that folder will be launched no more than once a day.