Apple-S auto performs the commons COMMAND-S keyword command, thus automatically saving your work in progress. The user can define the interval, and under which applications Apple-S will work.
This would be great if:
1. the save command would append the date and time to the filename or a sequence number. (filename20060219 2:05.jpg)And only work if there have been changes made to the file. (Command-s only saves if there have been changes by default but I don't know if this will be the default if the filename is appended)
2. It was configurable as a pref pane.
Great idea. I would suggest implementing it as a Preference Pane (for settings) coupled with a background process (to perform the actual task) to make the process somewhat more invisible to the user.