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Blogger finally supports OpenID, which means WordPress, LiveJournal or Vox users can directly leave comments on Blogger posts. For those who don’t know what OpenID is, it’s a simple URL, which can be used to sign into any site which supports OpenID. Since you’re the only one who has control over your URL, you’re the only one who can use that URL as your identity.

How to use your own site as your OpenID URL:

Like most people, I’m not comfortable with handing over the ownership of my personal identity to some third party OpenID handler. I want the flexibility to choose between OpenID providers without having to change my OpenID URL. How? Well, it’s pretty simple. All you got to do is pick any free OpenID provider and create an account (if you already have an account on WordPress, LiveJournal or Vox, you can skip this step). Now add the following lines just above </head> on your weblog or whichever URL you’d like to use as an OpenID URL:

<link rel="openid.server" href="http://www.myopenid.com/server"> 

<link rel="openid.delegate" href="http://username.myopenid.com/">

Replace openid.server href with your OpenID provider’s server URL. Similarly, replace openid.delegate href with your OpenID URL. For instance, if you want to use your WordPress blog as your OpenID provider, then it should be:

<link rel="openid.server" href="http://yourblogname.wordpress.com/?openidserver=1″>

<link rel="openid.delegate" href="http://yourblogname.wordpress.com/">

This way, you can change your OpenID provider anytime in the future by changing couple of lines. Your OpenID URL will still remain the same.

Free OpenID Providers (with their server URL):

• WordPress – http://yourblogname.wordpress.com/?openidserver=1
• LiveJournal – http://www.livejournal.com/openid/server.bml
• Vox - http://www.vox.com/services/openid/server
• VeriSign – https://pip.verisignlabs.com/server
• MyOpenID - http://www.myopenid.com/server

{Source: Simon Willison’s Weblog->tech-buzz.net - (c) logo openid.net}