Apple used todays Media Event to announce FaceTime for Mac OS X, allowing interoperability with “19 million other devices” that support the video calling system During stem. The new software is available only for Macs running OS X 10.6.4, and is available today as a beta from Apple’s website.

the event, Jobs referred to FaceTime as the “first video calling on mobile devices”, which of course is not true, but we have no doubt it is the first built in video calling system that people will actually use, particularly if they can communicate with people back at home using Macs and potentially other desktop or laptop computers.

Though FaceTime for Mac beta is a separate application, much of the core functionality is shipped inside the .App bundle as Frameworks which will likely be included in a future Mac OS X update as system wide frameworks.