Jon's best practices for servers

This is a consolidation of general best practices for servers I've learned and developed over the years. Feel free to share some of your own as well!

1. Never use telnet or ftp - use ssh or sftp instead.
2. Never use HTTP with anything that could compromise the integrity of your system.
3. Never login as root.
4. If you install it, keep it up to date.
5. If you don't use it, remove it.
6. Always check the changelog before updating.