When somebody writes a wordpress plugin for it you just know a technology is becoming mainstream 
Alan did the good work of writing a plugin that allows people to login to your weblog with openid accounts. I wondered what would happen to users that already had accounts so i asked Alen to which his clear reply was; they can choose or more precisely:
The plugin takes the place of the Wordpress Account Registration step. So, once a user registers with WPOpenID, they /are/ the wordpress user (for example) http-user-example.com. The only difference between this new user, and the user admin, that the OpenID users don’t have passwords set, and thus can’t login with the Username/Password combination.
However, there is nothing stopping an OpenID user from logging in, then visiting their profile, and changing their password to something else. If they do that, then the OpenID user can login with Username/Password as well.
In addition, if a normal wordpress user (for example, ‘admin’) wants to login with OpenID as well, they can visit My Profile => Your OpenID Identities (/wp-admin/users.php?page=your-openid-identities or /wp-admin/profile.php?page=your-openid-identities, depending on whether logged in as an admin), and add OpenID identities to the account. Afterward, the user can login with any/all of the identities listed, or their original username/password.
It is intended that there NOT be two separate accounts, one Username/password and the other OpenID. If that situation is created, there’s currently no easy method to merge them.
…which means i know a lot of blogs which will start implementing this little gem soon.
