[beagledude]

not trusting them with any creds

[bravura]

Aside: what is the risk associated with giving someone your google authentication?

[jufo]

You are not giving them your Google credentials - you are allowing them to use Google to sign you in, confirming your identity (name, email). Technical details are here: http://code.google.com/apis/accounts/docs/OpenID.html - the key point is that your password remains private between you and Google.