Beta going out today.
Moments earlier at Apple's Back to the Mac event, Steve Jobs and Phil Schiller announced the launch of FaceTime for Mac. The FT beta-release will be available today, allowing Mac users to chat face-to-virtual-face with 19 million iPhone 4 / iPod touch users.
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More details are likely to be released via press release after the event, or later on in the keynote. We'll update you as things develop.