While the rest of the world has yet to taste the sweet elixir of free voice calls from its email supplier, US-based Gmailers are having their fun extended for a whole new year. Back in August, Google made it possible to dial up voice numbers in the US and Canada for free, and now, in the true holiday spirit of keeping users happy and advertising dollars flowing, Google promises to keep that service free through all of 2011. And if it decides to extend it into 2012, we could have free calls until the end of the world.