At the moment, you can not use OpenID to leave comments on the site. This is mainly due to some bugs in the OpenID plugin that I will sort out and figure out. It might also be tied to the fact that my hosting service is upgrading to PHP5 and the version of PHP5 they are using causes issues with the current version of the OpenID plugin.
I’ll get it worked out here real soon (probably around the time I finish the new theme I’m working on). And I’ll get OpenID comments working again.
I really wish that the WordPress developers would just integrate OpenID into WordPress so that WordPress users can have an OpenID and they can integrate it into their sites with ease.