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 need not register to my site. They can just sign in with their accounts on the above sites.
If you've a solution, I'd prefer a PHP and MySQL based one.
See here: Google Login PHP Class.
Also be sure to refer to the Google Federated Login site for more info.