I would love to be able to "photocopy" notes. Many times when I find notes around Ur, I'm torn between taking them for my collection, and leaving them for others to read and enjoy!
Perhaps a machine in the Bureaucratic Hall? You would pay a small fee, put a note in the machine, and it returns both the original note and a photocopy. The photocopy would act like a regular note (you can post it on note poles) but it includes both a "written by" and a "photocopied by" section.