Google Mail or Gmail is now enabled to make phone calls. This new ability is a combination of Google voice and your standard gmail. Much like skype you will now be able to dial phone numbers from your computer and receive phone calls through your own personal Google Voice number.
Calls within the U.S. and Canada will be free while other countries such as the U.K. and France will cost as little as 2 cents a minute.
This service should be available for users within the U.S. on Wednesday. As of now the international launch date is unannounced.
-TwisT