Gmail Google Voice extends free calls to US numbers through 2011
The VoIP service also allows calling other locations for a lower fee than you would get on your carrier, but the free option is valid only for U.S. and Canadian numbers. Just recently, Google added a separate call recording button, which is a welcome addition as the feature was present, but with no dedicated button it was hard to find for many. We certainly appreciate Google's offer – what could be more affordable than free, right?
source: Gmail Blog via Engadget