Google Phone Calls

POWER TIP

Phone calls from Gmail

Now you can call any phone right from within Gmail. Dialing a phone
number works just like a normal phone—just click “Call phone” at the
top of your chat list, and dial a number or enter a contact’s name. At
the moment, this feature is only for Gmail users in the U.S. Calls to
the U.S. and Canada will be free for at least the rest of 2010, and
calls to other countries will be billed at our very low rates.
http://www.gmail.com/call