A couple of weeks ago, I discovered that I could no longer log-in to post updates to this site. I decided that that this was a sign from the computer gods (or perhaps my Internet service provider) that it was time to upgrade my Drupal installation.
So now this site is running the latest version of Drupal (6.8 as I write this).
I didn't migrate the user accounts, however, so if you want to post comments, you will need to register again for a user account. Apologies for the inconvenience.