FREE PHONE CALLS IN GMAIL

Gmail users will be able to make calls from their Web browser -- provided there's a mic and speakers -- to the phones of people in the U.S. and Canada for free, at least for the remainder of the year, and at a low rate internationally. Click on Chat, then Call Phone, dial the number and that's it.  You can also make video calls like Skype.

https://mail.google.com/