OpenID - Eliminates Need for Multiple Usernames Across Different Websites

What is OpenID?

OpenID eliminates the need for multiple usernames across different websites, simplifying your online experience.

You get to choose the OpenID Provider that best meets your needs and most importantly that you trust. At the same time, your OpenID can stay with you, no matter which Provider you move to. And best of all, the OpenID technology is not proprietary and is completely free.

OpenID can log you into thousands of websites like Yahoo! and Blogger using a single username and password. OpenID assigns a URL to registered users and with the URL, you use it to login. You prove you own a URL — not an email address, not a password, not your mother's maiden name, just a URL that must be confirmed by both the accepting site and OpenID host. No more filling out web site registration forms.

http://openid.net/what/

Register for OpenID
http://www.myopenid.com/

Pros and Cons of OpenID
http://lifehacker.com/software/technophilia/one-openid-to-rule-them-allor-not-302156.php

Yahoo! and Blogger Become OpenID Providers
http://blogoscoped.com/archive/2008-01-18-n79.html

List of sites that are OpenID enabled
https://www.myopenid.com/directory

Blogger In Draft with OpenID Commenting
http://bloggerindraft.blogspot.com/2007/11/new-feature-openid-commenting.html