To me this isn't about making phone calls over IP.  This is about video conferencing over IP.  I'm guessing that Apple has toyed with forward facing cameras in their iPhones and their iPads and I'd be willing to bet they pulled them from the iPad's launch so they could have something to refresh the iPad line up 9 months or so after launch.  My guess is in iPhone OS 4, the next iPads and possibly the next iPhone will contain some sort of multitasking capable option, forward facing cameras and thus video supported communications.  The iPad, in particular, will finally make video conferencing comfortable. In fact, I might call live video the iPad's killer app.