This morning I finally got around to upgrading the website from Drupal 4.7 to 5.1. The upgrade was relatively smooth and hopefully nothing is fundamentally broken. The update took a while to happen because many of the modules used to provide specific site functionality had not been upgraded to be 5.0 compatible.
Over the next few months I plan to make some aesthetic changes to increase usability and the general aesthetic. If you experience any issues with the site please contact me.