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http://openid.net/get-an-openid/what-is-openid/

What is OpenID? | OpenID

OpenID allows you to use an existing account to sign in to multiple websites, without needing to create new passwords.
http://www.oauth.net/

OAuth Community Site

OAuth is a simple way to publish and interact with protected data.

Account Sign-in: 8 Design Mistakes to Avoid

Along with their popular line of high-end networking equipment, Cisco Systems offers something else for Cisco.com visitors to buy: a line of Cisco-brand leisure wear and accessories, everything from wind breakers to golf balls. http://www.uie.com/articles/account_design_mistakes
http://www.uie.com/articles/account_design_mistakes_part2

8 More Design Mistakes with Account Sign-in

(Editor's note: In Part I of this article , Jared talked about the first eight of the design mistakes with account sign-in. In this article, he shares eight more mistakes.