Google Click-to-Call

Another one from the Google team:

When you click the phone icon, you can enter your phone number. Once you click 'Connect For Free,' Google calls the number you provided. When you pick up, you hear ringing on the other end as Google connects you to the other party.

The product is only being tested in some states in US at the moment - but suddenly internet calls and Google Talk makes a lot of commercial sense..

Reference:
http://www.google.com/help/faq_clicktocall.html