Sign in to Hundreds of Web Sites Using Yahoo ID

Are you tired of creating a new account on every web site you use? Do you avoid new web sites 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. The OpenID technology will allow you to use your Yahoo! account to sign in to hundreds of web sites! And this list is growing every day...

Once you enable your Yahoo! account for OpenID access, you can simply tell any OpenID enabled web site that you are a Yahoo! user. You will be sent to Yahoo! to verify your Yahoo! ID and password and then signed in to the web site. Its that easy!

Get more info from here.