Google Voice lets you manage all your phone communications and seamlessly make and receive calls on any of your existing phones. But what if you don’t have your phone with you? Or what if you’re in a place with poor cell phone reception, or you’re travelling internationally and don’t want to incur expensive roaming charges? Wouldn’t it be great if you could use your computer to make or receive calls?
Starting today you can use Gmail to receive or place Google Voice calls.
:source: Source: Google Voice Blog
http://www.youtube.com/watch?v=_-DzpAg0SdU