We have talked about the Free Calls Using Google Voice and Unreleased Google Voice Desktop App. Finally here is the Google way of calling phones. If you have got the Gmail, you can make free calls (video calls too) to US and Canada and for other countries there are very much low calling rates.
People are using more and more video chat from Gmail and iGoogle. Video chat, voice chat, and group chat are available within Gmail, Orkut and iGoogle. If you look at the image above it reveals a bit updated version of it.