Google introduces Call from Gmail, free calls to US and Canada
Philippines - Mobile $0.17
Dialing a phone number works just like a normal phone. Just click “Call phone” at the top of your chat list and dial a number or enter a contact’s name.
A friend in the US told me yesterday it is now working in the United States. So just wait if you will see the "Call Phones" in your Google Chat is viewable.
You need to download the GOOGLE CHAT and VOICE plug-in here.
Once it gets available and I've tried it I will also blog the step by step process here. So stay tuned or subscribe to my feeds.