Google Click-to-Call

THIS could be huge!

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.
We won't share your telephone number with anyone, including the advertiser. When you're connected with the advertiser, your number is blocked so the advertiser can't see it. In addition, we'll delete the number from our servers after a short period of time.

And every call is free - obviously some kind of VOIP solution. How cool is this?!