You forget that the iPhone, like many of Apple's products, is designed to suck you into the vortex of Apple-world without looking back. We know that ATT is going to announce tethering with the iPhone. It stands to reason that you may use the iPhone to make a video call while tethered to your MAC and use it's iSight camera and other iChat goodies. I'm sure they'll add non-mac support for PC's running webcams and a Windows version of iChat that they'll launch the same time they announce this.
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You forget that the iPhone, like many of Apple's products, is designed to suck you into the vortex of Apple-world without looking back. We know that ATT is going to announce tethering with the iPhone. It stands to reason that you may use the iPhone to make a video call while tethered to your MAC and use it's iSight camera and other iChat goodies. I'm sure they'll add non-mac support for PC's running webcams and a Windows version of iChat that they'll launch the same time they announce this.