First it was Yahoo! and now the avalanche is fast: just a few days ago Microsoft announced that Windows Live was OpenID and Google today becomes supplier of OpenID: your Gmail account may serve as authentication on sites that support a standard that has suddenly multiplied by millions their area of penetration: the three big Internet are now territory OpenID
Google goes even further: together to support OpenID and OAuth.
To test the new functionality, still experimental and limited, you must request it through this form
The news on the blog Google Code