OpenID

You know that all Google/Gmail accounts are also OpenID identities, right? Well, assuming so, have you ever wondered how you can use your Google/Gmail account as an OpenID sign-in to a website? Here is one way of doing such...

Visit http://openid-provider.appspot.com/ and then follow the instructions on the provided page. It's that simple!

I discovered how this is done by reading: http://www.labnol.org/internet/favorites/use-google-account-email-openid...