Howdy, I might be looking at this module hoping it does something it's not intended to do, but regardless, that first paragraph on the project page is really confusing.
"By using this module, web applications can access a user's Google Apps account without needing the user's login details."
"user's login details" refers to Drupal or Google log in details?
"The user logs into the site with their Drupal username and password."
So this module is not used for logging into Drupal with your Google account?
"Once authenticated, they are then immediately redirected to the Google login page where they must confirm (or reject) that the website is allowed to use an authorization token to access their Google account."
So this gives the site authorization for calling the Google API in regards to the user's account, cool. But... Can user's log into Drupal with their Google credentials? Am I barking up the wrong tree?
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Comment #1
stella commentedweb apps can access a user's GApps account without needing the user's GApps login details.
No, it doesn't. SAML method would allow this but Google only allow the inverse (i.e. log in to Google with Drupal creds). Only option available for this really is OpenID.
No, see previous answer.
As the project page says, you should really read the blog post at http://stellapower.net/blog/google-authentication-methods to try and figure out the best authentication method for you. It even goes so far as to tell you which Drupal modules implement each method.