OS: Mac OS X
A very slow, and rather stupid, ditto wrapper for OS X. The comments in the script are very, ah, verbose. I'm not using this any more as we've migrated to netatalk2, which ceases to cause OS X to reboot during long transfers (yay).
A rather simple script meant to be cron'd to enforce certain file permissions and ownerships.
A supreme ghetto-hack I kicked out in a few minutes to transfer the contents of the password file from a corrupted root disk on our primary mailserver to a new machine. It would easily be made more automated, but I'm not sure I care that much. The comments explain my reasoning.
A very simple backup script. Pretty self-explanatory. Written in shell.