Tried adding a comment on a friend's livejournal blog, and it gave me an option of using an OpenId. Sounded interesting and i had to go and check what it is.

Yup, as the title of this post suggests, OpenId is another Single-Sign-On. Checked technorati, and their OpenId's wiki and found that there are there single sign ons also. (Check LID and its wiki). Sounds promising considering that they have used REST principle (ya, similar to my previous post). Further they are trying to get LID and OpenId to interoperate. (project named Yadis.

Good feature about LID. If you do not want to trust them with your identity, etc.etc. u can go ahead and host it on your own server.

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