It may be an expected holiday gift, but it's still a nice one: Google's VoIP service in Gmail will remain free of charge for calls within the United States and Canada in 2013. A note on the Gmail Blog announced as much this morning; the news ushers in a thrilling third year of free Google Voice service for US and Canadian customers, right through the standard Gmail interface. Of course, we prefer the retro-inspired phone booth that Google showed off back in 2010
