GOOGLE HAS upped the stakesin the battle for domination of the consumer Desktop by launching a free online voice and text messaging tool. Google Talk enables Gmail account holders (Google’s web-based email service) to chat using text or to make a voice call using a microphone and speakers or an integrated headset. The tool is still in the beta testing stage but isavailable free atwww.google.com/talk. Unlike Gmail, Google Talk will not feature any form of advertising, the company said, although it is expected to encourage more people to sign up for Gmail. Currently people have to be invited to join Gmail and the company would not confirm when its email tool would become generally available.........