So FaceTime is still an open platform if anybody actually decides to port it to other OS's... Just saying...
Somebody would have already ported Facetime to other platforms if it were an open standard. Apple hasn't published any specs for anyone to do so nor submitted them to any standards bodies, so nobody can. Steve said they were going to do this, but it hasn't been a year and they haven't and all the evidence is that Apple never will at this point (just as the iOS version of Webkit appears to no longer be open source as the code isn't getting published any more )
Phazer