http://www.askthepony.com/blog/2011/07/setup-a-complete-django-server-deploy-rollback-%E2%80%93-all-in-one-powerful-script/
A script to set up and deploy django servers. Hat tip rob.
http://ubuntuforums.org/showthread.php?t=451510
An out of date guide on how to setup scponly and a chrooted scponly. It includes info on a bug (dev/null) which is now fixed, but otherwise it generally applies.
http://www.ubuntugeek.com/monitoring-ubuntu-services-using-monit.html
A howto on setting up monit on an Ubuntu server. Fairly simple and straightforward. Includes basic info on customising alerts and so on.
http://www.gentoo.org/proj/en/keychain/
Keychain is a front end for ssh-agent which sets up one ssh-agent session per machine reboot. Useful for unattended backups, and so on, as the key passwords need only be provided once per reboot.
http://www.rsnapshot.org/
rsnapshot is a perl utility that creates (illusory) filesystem snapshots using rsync and hardlinks (to save space). Every time a file is changed, a new copy is created, otherwise a hard link is used. It works hourly, daily or monthly.
http://www.sysadmin.hep.ac.uk/wiki/DatabaseBackup
Useful article on how to backup and restore MySQL databases. Includes example commands and a basic overview of the theory.