Are you tired of creating a new account on every website you use? Do you avoid new websites because they come with yet another username and password? Do you paste stickies with password hints all over your computer monitor? OpenID is an open technology standard that solves all of these problems. SSO for the Web!
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."Here is a video from one OpenID provider (there are many, including Yahoo!) which explains the concept