playalistic said:FaceTime is only between iPhone 4 users at the mo' but the technology is an open standard from Apple so expect to see it implemented on PC/Mac chat clients and other phones in future.
H.264, AAC, SIP, STUN, TURN, ICE, RTP, and SRTP
http://blog.imtc.org/index.php/2010/06/09/the-technology-behind-apples-facetime-standards/
Looking at that, there's no reason why this wouldn't allow you to dial in to your Cisco telepresence or PolyCom video conferencing suite in the office, connect to virtually any of the standards based video chat clients or just make a standard SIP call to any other VOIP phone - I can't imagine the mobile networks will be too happy about that, but it will be interesting to see what develops with it