This script makes a list of folders in the 'Users' directory of the startup disk for the user to choose from; the 'Shared' folder is included, but can easily be removed by adding it to the excluded_users property at the top of the script. The same goes for the 'Admin' option. I am willing to see improvements on the script as I am sure it could be improved.
[robg adds: I haven't tested this one ... and keep in mind that changing permissions can lead to sometimes unintended consequences, so use some caution...]

