I was very pleased to find out today that the WordPress OpenID plugin was updated. Among some general fixes, the newest version supports acting as an OpenID provider. In other words, I can use my “andrewski.net” domain to sign in to any OpenID-enabled websites, of which there are plenty. I can then manage my authentications within my WordPress settings. All very good stuff.
(One heads-up: the OpenID plugin encourages you to install the XRDS-Simple plugin. The description is there, but I missed it.)
My general goal is to make my domain as useful as possible, and this is definitely a big step.