Making phone calls through Gmail

Till now we are knowing making video and audio calls from Gmail. When video and audio chat was introduced it made a new revolution , Google reached many peoples. Now they have moved another one step forward. In this year they have made an option to call from Gmail to another person cell phone.

Photo from : Google Blog

 This one is good , revolutionary one also it charges some prices. Right now calls withing U.S and Canada are free. Here below is the blog in which you can get more information.
http://gmailblog.blogspot.com/2010/08/call-phones-from-gmail.html