More than once I have turned off my computer and walked away, only to remember later I left my flash drive plugged in. It would be great to have a small app that alerted me to the fact. It could be a message box, a sound, or something else. It could prevent the machine from shutting down until the flash drive was removed, until the user clicked an "OK" button, or it could do nothing more than remind users a thumb drive was plugged in.