For LOAD (Linux Open Administration Days), I had to provide shell access to a few people in order to maintain the Drupal site. Since this is a multisite Drupal installation, simply providing shell access would be a huge security issue.
Here's how I secured it as much as possible:

Step 1: create an ssh chroot jail

cd /usr/local/sbin
wget http://www.fuschlberger.net/programs/ssh-scp-sftp-chroot-jail/make_chroo...
chmod 700 /usr/local/sbin/make_chroot_jail.sh

I adapted the script to include vi. Next I created a user.

I must have missed something, but I didn't know of a Flemish vilage called Unnu, let alone a village that exists in East-Flanders, West-Flanders _and_ Flemish Brabant ... ;-)

http://maps.google.be/maps/place?cid=9496107104178907831&q=sony+zaventem...
http://www.mercuriusgids.be/UNNU/Afvalbehandeling
http://www.mercuriusgids.be/TNT
http://www.infobel.com/nl/belgium/business/111000/Kantoorbenodigdheden+/...

Forgive me for this title, but I'm frustrated, and upset. After all the trouble I had with my previous VPS, the hoster decided to delete my account, and with it, the full backup of my virtual server, so I had to set up a new server with a different hoster. *sigh*