While doing some research for a project, I decided to install and configure the Drupal OpenID module to see whether it would suit my needs.

Here's what I did:

Set up OpenID identity server
Unfortunately, the OpenID server component is only available in Drupal 4.7 (although the project is looking for people to step up and help with the port to Drupal 5). Seeing as I didn't have an instance of 4.7 to play on, I set up a stock installation with no contributed modules.