Use your Google Login as an OpenID!

Technorati is the recognized authority on what's going on in the world of weblogs. We help people search for, surface, and organize bloggers and their daily posts. You can claim your blog on technorati using OpenID.

First standalone OpenID provider.  Full featured solutions for both individuals and businesses. 

WordPress plugin to support OpenID authentication for commenting and user registration.

OpenID for comments on Blogger in Draft...

phpMyID is an Open Source, standalone, single user, OpenID Identity Provider

"Plaxo, Inc. keeps people connected by solving the common and frustrating problem of out-of-date contact information. [...] Plaxo is the universal digital assistant; available to you wherever and whenever you need it to keep you organized, on top of your life and in touch with those you care about." (http://www.plaxo.com/about) Sign Up/In via http://www.plaxo.com/openid

Simple OpenID provider with intuitive ID form of '{id}.myid.net'.
It also Identity management service for any OpenID logged in users as a consumer. It currently provides portable contact list, groups having simple Open API with which any service can check membership, and get member list.
This is the first korean OpenID server also.

lets you use your Yahoo! account as an OpenID.

Start your Internet experience at AOL.com and find what you are looking for; including AOL downloads, video on demand, email, and more. Signup for a screen name and you get a OpenId. the addess for your AOL OpenId is www.openid.aol.com/(screename)