Article explaining how to create a custom 503 maintenance page and have it served by default in various situations (migrations for example). Very useful.
Forwarding all web traffic from an old to a new server with nginx, includes a sample config for nginx. Useful.
A script to set up and deploy django servers. Hat tip rob.
Useful article on how to deploy django apps on nginx. Handy.
Interesting write up by James at Incsub on how they handle scale on edublogs. Some good advice although a little light on specifics, a good starting point for research.