How do you enable customers to log in to your site using their Google account?

Question

I just saw http://uservoice.com/login. It uses Google accounts, Myspace, Yahoo, OpenID and all to sign in customers into its site? Can I do that?

I mean, customers n

Answer 1

Uservoice users RPX http://rpxnow.com . You can easily use it with PHP, just https and parse the json or xml repsonse. You don't even need to change your database schema or store anything locally.