Instead of giving an username, email and website to comment on a post, this plugin enables the use of an OpenID account to add the comment.
Simple OpenID plugin is a plugin for WordPress that enables visitors to use their OpenID if they want to post a comment instead of a registering yet another local WordPress account or typing their credentials over and again.
In the OpenID lingo: the plugin acts as a consumer and checks the user’s credentials which are stored on the OpenID provider he/she’s registered with.
What is OpenID? A blurb from the website (http://openid.net):
OpenID is an open, decentralized, free framework for user-centric digital identity.
How does it work? Instead registering 10 accounts at 10 different websites, OpenID makes it possible to use only 1 account. This means you only have to remember one username/password combo.
OpenID is a flexibel protocol. Most of the crypto-authentication stuff is done behind the curtains. The only thing you have to do is type in your OpenID URI (i.e. your website or the URL pointing to your OpenID account), authenticate with your OpenID provider and everything else is taken care of.
This plugin relies heavily on the JanRain OpenID library for PHP.
Note: This software is still under heavy development and provided as is. Installation and usage at your own discretion!