calum.org is hosted on a linuxvps.org Linux Virtual Private Server. Why not get your own?
I decided I wanted two Tomcats running on the same box, one for "live", and one for "dev".
I'm going to put these notes here, for me, so I can do it again if I stuff things up, and for other people. You can cut and paste these commands blindly, or do them one at a time.
I did this on a Ubuntu "Jaunty" server, with 6.0.18-0ubuntu6.1 installed. Your mileage may vary if you have a different distro/version.
Decisions I made: